SEBASTIEN children's underwear and swimsuit pattern PDF
Sébastien is a pattern for boys' underwear and swimwear. For the underwear set, the tank top is made with ribbed armholes and neckline. The boxer shorts feature an elasticated waistband, a lined crotch gusset on the front, and a back with no center seam. The pattern also includes a fully lined, form-fitting swim trunks with seams in the center instead of the side.
Underwear and a swimsuit; a must-have in your little boy's wardrobe!
Available from 3 to 12 years old.
Share your creations or get inspiration on Instagram using hashtag #ikateesebastien.
Video tutorial
Size range
3, 4, 5, 6, 7, 8, 9, 10, 11, 12 years old.
Choosing the right size for underwear or swimwear: these products must fit very close to the body (especially for stockings, panties or boxers because these are small items for which height is less important than the build and age of the child....) it is recommended not to take an age higher than the child's actual age. For example, until a child reaches 7 years old, make small items of swimwear and underwear in 6 years. If in doubt, it is better to take the size below than the size above.
See size guideSewing level
Easy to intermediate
What you will learn with this pattern: how to add fine ribbing to a tank top, how to line a gusset of underwear, how to line a swimsuit, how to add elastic to the waistband.
Fabrics & Supplies
- Suggestion tissus
- Maille : bord-côte, jersey, lycra, doublure de maillot de bain (mousse claudia)
- Fournitures
- Élastique large de 3 à 4 cm pour le caleçon sous-vêtement
- Élastique large de 2 cm pour le caleçon de maillot de bain
- Fil mousse et fil polyester basique
- Aiguilles microtex (ou minimum à jersey ou stretch), le microtex est recommandé pour le maillot de bain
- Aiguille double pour les ourlets
Contents of the pattern
- French tutorial
- English tutorial
- PDF pattern (multi-size and size by size) A4 or US letter format: 12 pages for ages 3 to 4, 15 pages for ages 5 to 12
- PDF pattern A0 format: 1 page
- Projectable PDF pattern
Seam allowances are included in the pattern.
The pattern download link is sent immediately upon receipt of payment.
Find all our advice for downloading and printing your PDF pattern in our dedicated tutorial.
Ikatee sewing patterns are for family and personal use only.
{"id":1929651060778,"title":"SEBASTIEN children's underwear and swimsuit pattern PDF","handle":"patron-de-couture-sous-vetement-et-maillot-sebastien-3-12a-pdf","description":"\u003ch1 style=\"text-align: left;\"\u003e Sewing pattern in bilingual PDF format. Boys ages 3 to 12.\u003c\/h1\u003e\n\n\u003cp\u003e Tank top and briefs underwear set\u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003eor tight swimsuit briefs.\u003cbr\u003e \u003cspan style=\"text-decoration: underline;\"\u003eUnderwear set\u003c\/span\u003e : tank top with ribbed armholes and neckline, briefs with elastic waistband and lined crotch gusset. Back with no center seam.\u003cbr\u003e \u003cspan style=\"text-decoration: underline;\"\u003eSwimsuit\u003c\/span\u003e with center seams, no side seams. Fully lined for comfort.\u003cbr\u003e The essential item for a boy's wardrobe.\u003c\/p\u003e\n\n\u003cp\u003e The tank top can also be sewn for girls!\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n \u003cp\u003e\u003cstrong\u003e\u003cb\u003eThe pattern also exists in a paper pocket version to receive at home ( \u003ca href=\"https:\/\/ikatee.fr\/products\/pochette-patron-de-couture-sous-vetement-et-maillot-sebastien-3-12a\"\u003esee the pocket pattern\u003c\/a\u003e ).\u003c\/b\u003e\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\n\u003ch2\u003e \u003cstrong\u003eSewing Level: \u003cspan style=\"color: #999999;\"\u003eEasy to Intermediate\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/h2\u003e\n\n\u003cp\u003e \u003cb\u003e\u003cspan style=\"color: #bf9000;\"\u003eWhat you will learn with this pattern\u003c\/span\u003e :\u003c\/b\u003e how to add narrow ribbing to a tank top, how to line a gusset of underwear, how to line a swimsuit, how to add elastic to the waistband.\u003c\/p\u003e\n\n\u003ch2\u003e\n\n \u003cstrong\u003eSize range\u003c\/strong\u003e : \u003cspan style=\"color: #a5a4a3;\"\u003e3, 4, 5, 6, 7, 8, 9, 10, 11 and 12 years\u003c\/span\u003e\n\n\u003c\/h2\u003e\n\n\u003cp\u003e \u003cspan\u003e\u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003eChoosing the right size of underwear or swimwear\u003c\/span\u003e :\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\n \u003cp\u003eThese products must be very close to the body (for stockings, panties or boxers in particular because these are small pieces for which the height is less important than the build and age of the child....) it is recommended not to take an age higher than the actual age of the child. For example, until a child reaches 7 years old, make the small pieces of swimsuits and underwear in 6 years. If in doubt, it is better to take the size below than the size above.\u003c\/p\u003e\n\n\u003ch2\u003e \u003cstrong\u003eSubject suggestions:\u003c\/strong\u003e\n\u003c\/h2\u003e\n\n\u003cp\u003e \u003cspan style=\"text-decoration: underline;\"\u003eUnderwear\u003c\/span\u003e : jersey, preferably in stretch cotton (with elastane) + ribbed cuffs to be cut into strips\u003c\/p\u003e\n\n\u003cp\u003e \u003cspan style=\"text-decoration: underline;\"\u003eSwimsuit\u003c\/span\u003e : polyamide lycra (mesh swimsuit material) + swimsuit lining (claudia foam or same material as swimsuit polyamide-lycra).\u003c\/p\u003e\n\n\u003ch2\u003e PDF files:\u003c\/h2\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cspan\u003e\u003c\/span\u003e 12-page tutorial (bilingual French\/English)\u003c\/li\u003e\n\n\u003cli\u003e \n\u003cspan\u003e\u003c\/span\u003ePDF pattern in A4 or US letter format: 12 pages to print for ages 3 to 4, 15 pages for ages 5 to 12. (one file per size + 1 multi-size file)\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cspan\u003e\u003c\/span\u003e PDF pattern A0 format: 1 page\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003ca href=\"https:\/\/ikatee.fr\/pages\/projection-de-patron-de-couture-comment-ca-marche\"\u003eProjectable PDF pattern\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003ch2\u003e Supplies :\u003c\/h2\u003e\n\n\u003cp\u003e 3 to 4cm wide elastic for underwear\u003cbr\u003e 2cm wide elastic for swimsuit briefs\u003cbr\u003e Foam thread and basic polyester thread\u003cbr\u003e Microtex needles (or at least jersey or stretch!), microtex is recommended for swimwear\u003cbr\u003e Double needle for hems or overlock = coverstitch machine\u003cbr\u003e Plastic clips instead of pins for swimsuit material\u003cbr\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\u003ch4\u003e \u003cspan style=\"color: #bf9000;\"\u003esee required footage in the \"supplies to be provided\" tab at the bottom of the page\u003c\/span\u003e\n\u003c\/h4\u003e\n\n \u003cp\u003e\u003cstrong\u003e\u003cspan style=\"color: #cc0000;\"\u003eA range of \u003ca style=\"color: #cc0000;\" href=\"https:\/\/ikatee.fr\/collections\/jerseys\"\u003ejersey\u003c\/a\u003e fabrics, \u003ca style=\"color: #cc0000;\" href=\"https:\/\/ikatee.fr\/collections\/bord-cotes\"\u003eribbing\u003c\/a\u003e , \u003ca style=\"color: #cc0000;\" href=\"https:\/\/ikatee.fr\/collections\/maillot-de-bain\"\u003elycra for swimwear\u003c\/a\u003e and \u003ca style=\"color: #cc0000;\" href=\"https:\/\/ikatee.fr\/collections\/elastiques\"\u003eelastics\u003c\/a\u003e are available in our online store.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\u003ch3\u003e \u003cspan style=\"color: #000000;\"\u003e\u003ca style=\"color: #000000;\" href=\"https:\/\/ikatee.fr\/pages\/tutoriel-video-du-patron-de-couture-enfant-garcon-sebastien\"\u003eWatch the full video of Sébastien's editing\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\n\n\u003cp\u003e \u003ca href=\"https:\/\/ikatee.fr\/pages\/tutoriel-video-du-patron-de-couture-enfant-garcon-sebastien\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1051\/5902\/files\/1_6d055dcc-317a-4d04-85bc-f3221e75c388_large.png?v=1555662269\"\u003e\u003c\/a\u003e\u003c\/p\u003e","published_at":"2019-04-08T15:51:51+02:00","created_at":"2019-04-08T07:29:27+02:00","vendor":"ikatee","type":"Sewing pattern","tags":["Bain","BF20","boxer","Braderie_ Patrons PDF","Collection_Garçon","maillot de bain","Niveau de couture_Facile","Niveau de couture_Intermédiaire","Patrons_Enfant","Projetable","Saisons_Automne hiver","Saisons_Printemps été","sport","Symmetry","Vêtements _Maillot de bain","Vêtements 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","id":7681131479082,"position":19,"preview_image":{"aspect_ratio":0.999,"height":1201,"width":1200,"src":"\/\/ikatee.fr\/cdn\/shop\/products\/SEBASTIENbilingue17_242.jpg?v=1755711090"},"aspect_ratio":0.999,"height":1201,"media_type":"image","src":"\/\/ikatee.fr\/cdn\/shop\/products\/SEBASTIENbilingue17_242.jpg?v=1755711090","width":1200}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch1 style=\"text-align: left;\"\u003e Sewing pattern in bilingual PDF format. Boys ages 3 to 12.\u003c\/h1\u003e\n\n\u003cp\u003e Tank top and briefs underwear set\u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003eor tight swimsuit briefs.\u003cbr\u003e \u003cspan style=\"text-decoration: underline;\"\u003eUnderwear set\u003c\/span\u003e : tank top with ribbed armholes and neckline, briefs with elastic waistband and lined crotch gusset. Back with no center seam.\u003cbr\u003e \u003cspan style=\"text-decoration: underline;\"\u003eSwimsuit\u003c\/span\u003e with center seams, no side seams. Fully lined for comfort.\u003cbr\u003e The essential item for a boy's wardrobe.\u003c\/p\u003e\n\n\u003cp\u003e The tank top can also be sewn for girls!\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n \u003cp\u003e\u003cstrong\u003e\u003cb\u003eThe pattern also exists in a paper pocket version to receive at home ( \u003ca href=\"https:\/\/ikatee.fr\/products\/pochette-patron-de-couture-sous-vetement-et-maillot-sebastien-3-12a\"\u003esee the pocket pattern\u003c\/a\u003e ).\u003c\/b\u003e\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\n\u003ch2\u003e \u003cstrong\u003eSewing Level: \u003cspan style=\"color: #999999;\"\u003eEasy to Intermediate\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/h2\u003e\n\n\u003cp\u003e \u003cb\u003e\u003cspan style=\"color: #bf9000;\"\u003eWhat you will learn with this pattern\u003c\/span\u003e :\u003c\/b\u003e how to add narrow ribbing to a tank top, how to line a gusset of underwear, how to line a swimsuit, how to add elastic to the waistband.\u003c\/p\u003e\n\n\u003ch2\u003e\n\n \u003cstrong\u003eSize range\u003c\/strong\u003e : \u003cspan style=\"color: #a5a4a3;\"\u003e3, 4, 5, 6, 7, 8, 9, 10, 11 and 12 years\u003c\/span\u003e\n\n\u003c\/h2\u003e\n\n\u003cp\u003e \u003cspan\u003e\u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003eChoosing the right size of underwear or swimwear\u003c\/span\u003e :\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\n \u003cp\u003eThese products must be very close to the body (for stockings, panties or boxers in particular because these are small pieces for which the height is less important than the build and age of the child....) it is recommended not to take an age higher than the actual age of the child. For example, until a child reaches 7 years old, make the small pieces of swimsuits and underwear in 6 years. If in doubt, it is better to take the size below than the size above.\u003c\/p\u003e\n\n\u003ch2\u003e \u003cstrong\u003eSubject suggestions:\u003c\/strong\u003e\n\u003c\/h2\u003e\n\n\u003cp\u003e \u003cspan style=\"text-decoration: underline;\"\u003eUnderwear\u003c\/span\u003e : jersey, preferably in stretch cotton (with elastane) + ribbed cuffs to be cut into strips\u003c\/p\u003e\n\n\u003cp\u003e \u003cspan style=\"text-decoration: underline;\"\u003eSwimsuit\u003c\/span\u003e : polyamide lycra (mesh swimsuit material) + swimsuit lining (claudia foam or same material as swimsuit polyamide-lycra).\u003c\/p\u003e\n\n\u003ch2\u003e PDF files:\u003c\/h2\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cspan\u003e\u003c\/span\u003e 12-page tutorial (bilingual French\/English)\u003c\/li\u003e\n\n\u003cli\u003e \n\u003cspan\u003e\u003c\/span\u003ePDF pattern in A4 or US letter format: 12 pages to print for ages 3 to 4, 15 pages for ages 5 to 12. (one file per size + 1 multi-size file)\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cspan\u003e\u003c\/span\u003e PDF pattern A0 format: 1 page\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003ca href=\"https:\/\/ikatee.fr\/pages\/projection-de-patron-de-couture-comment-ca-marche\"\u003eProjectable PDF pattern\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003ch2\u003e Supplies :\u003c\/h2\u003e\n\n\u003cp\u003e 3 to 4cm wide elastic for underwear\u003cbr\u003e 2cm wide elastic for swimsuit briefs\u003cbr\u003e Foam thread and basic polyester thread\u003cbr\u003e Microtex needles (or at least jersey or stretch!), microtex is recommended for swimwear\u003cbr\u003e Double needle for hems or overlock = coverstitch machine\u003cbr\u003e Plastic clips instead of pins for swimsuit material\u003cbr\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\u003ch4\u003e \u003cspan style=\"color: #bf9000;\"\u003esee required footage in the \"supplies to be provided\" tab at the bottom of the page\u003c\/span\u003e\n\u003c\/h4\u003e\n\n \u003cp\u003e\u003cstrong\u003e\u003cspan style=\"color: #cc0000;\"\u003eA range of \u003ca style=\"color: #cc0000;\" href=\"https:\/\/ikatee.fr\/collections\/jerseys\"\u003ejersey\u003c\/a\u003e fabrics, \u003ca style=\"color: #cc0000;\" href=\"https:\/\/ikatee.fr\/collections\/bord-cotes\"\u003eribbing\u003c\/a\u003e , \u003ca style=\"color: #cc0000;\" href=\"https:\/\/ikatee.fr\/collections\/maillot-de-bain\"\u003elycra for swimwear\u003c\/a\u003e and \u003ca style=\"color: #cc0000;\" href=\"https:\/\/ikatee.fr\/collections\/elastiques\"\u003eelastics\u003c\/a\u003e are available in our online store.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\u003ch3\u003e \u003cspan style=\"color: #000000;\"\u003e\u003ca style=\"color: #000000;\" href=\"https:\/\/ikatee.fr\/pages\/tutoriel-video-du-patron-de-couture-enfant-garcon-sebastien\"\u003eWatch the full video of Sébastien's editing\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\n\n\u003cp\u003e \u003ca href=\"https:\/\/ikatee.fr\/pages\/tutoriel-video-du-patron-de-couture-enfant-garcon-sebastien\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1051\/5902\/files\/1_6d055dcc-317a-4d04-85bc-f3221e75c388_large.png?v=1555662269\"\u003e\u003c\/a\u003e\u003c\/p\u003e"}
