SEBASTIEN children's underwear and swimsuit paper sewing pattern
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
- Fabric suggestions
- Knits: ribbing, jersey, lycra, swimwear lining (Claudia foam)
- Supplies
- 3 to 4 cm wide elastic for underwear briefs
- 2 cm wide elastic for swim trunks
- Foam thread and basic polyester thread
- Microtex needles (or at least jersey or stretch needles), microtex is recommended for swimwear
- Double needle for hems
Contents of the pattern
- Bilingual French/English tutorial
- Multi-size pattern sheet. On this pattern, the pieces do not overlap.
Seam allowances are included in the pattern.
The cover is shipped upon receipt of payment.
For more information about shipping, see our dedicated page .
Ikatee sewing patterns are for family and personal use only.
{"id":1927665418282,"title":"SEBASTIEN children's underwear and swimsuit paper sewing pattern","handle":"sebastien-children-underwear-and-swimsuit-paper-sewing-pattern","description":"\u003ch1 style=\"text-align: left;\"\u003eBilingual PDF digital sewing pattern. Boys aged 3 to 12.\u003c\/h1\u003e\n\u003cp\u003eUnderwear set with a tank top and briefs, or fitted swim briefs.\u003cbr\u003e\u003cspan style=\"text-decoration: underline;\"\u003eUnderwear set\u003c\/span\u003e: tank top with ribbing at the armholes and neckline, briefs with an elastic waistband and a lined front gusset between the legs. Back without a center seam.\u003cbr\u003e\u003cspan style=\"text-decoration: underline;\"\u003eSwim briefs\u003c\/span\u003e with center seams and no side seams. Fully lined for greater comfort.\u003cbr\u003eAn essential for a boy’s wardrobe.\u003c\/p\u003e\n\u003cp\u003eThe tank top can also be sewn for girls!\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cb\u003eThe pattern is also available as a paper pattern envelope delivered to your home (\u003ca href=\"https:\/\/ikadepottee.com\/products\/pochette-patron-de-couture-sous-vetement-et-maillot-sebastien-3-12a\"\u003esee the paper pattern\u003c\/a\u003e).\u003c\/b\u003e\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eSewing level: \u003cspan style=\"color: #999999;\"\u003eeasy to intermediate\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cb\u003e\u003cspan style=\"color: #bf9000;\"\u003eWhat you will learn with this pattern\u003c\/span\u003e: \u003c\/b\u003ehow to attach narrow ribbing to a tank top, enclose a briefs gusset, line swim briefs, and attach elastic to the waistband.\u003c\/p\u003e\n\u003ch2\u003e\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\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003eChoosing the right underwear or swimwear size\u003c\/span\u003e:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThese garments should fit very close to the body (especially bottoms, briefs, or boxers, as these are small pieces for which height is less important than the child's build and age....). It is strongly recommended not to choose an age above the child's actual age. For example, until a child has reached 7 years old, make the small swimwear and underwear pieces in size 6 years. If in doubt, it is better to choose the smaller size rather than the larger one.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eFabric suggestions:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003eUnderwear\u003c\/span\u003e: jersey, preferably stretch cotton (with elastane) + ribbing to cut into bands\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003eSwim briefs\u003c\/span\u003e: polyamide Lycra (knit swimwear fabric) + swimwear lining (Claudia swimwear lining or the same polyamide-Lycra fabric as the swimwear).\u003c\/p\u003e\n\u003ch2\u003e\n\u003cspan style=\"color: #bf9000;\"\u003e\u003c\/span\u003eSupplies:\u003c\/h2\u003e\n\u003cp\u003e3 to 4 cm wide elastic for the underwear briefs \u003cbr\u003e2 cm wide elastic for the swim briefs \u003cbr\u003eWoolly nylon thread and basic polyester thread \u003cbr\u003eMicrotex needles (or at least jersey or stretch needles!), Microtex is recommended for swimwear \u003cbr\u003eDouble needle for hems or a serger = coverstitch machine \u003cbr\u003ePlastic clips rather than pins for swimwear fabric\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cspan style=\"color: #bf9000;\"\u003esee the required fabric quantities in the footer tab \"supplies to prepare\"\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e \u003cstrong\u003e\u003cspan style=\"color: #cc0000;\"\u003eA selection of \u003ca href=\"https:\/\/ikadepottee.com\/collections\/jerseys\" style=\"color: #cc0000;\"\u003ejersey\u003c\/a\u003e, \u003ca href=\"https:\/\/ikadepottee.com\/collections\/bord-cotes\" style=\"color: #cc0000;\"\u003eribbing\u003c\/a\u003e, \u003ca href=\"https:\/\/ikadepottee.com\/collections\/maillot-de-bain\" style=\"color: #cc0000;\"\u003eLycra for swimwear\u003c\/a\u003e, and \u003ca href=\"https:\/\/ikadepottee.com\/collections\/elastiques\" style=\"color: #cc0000;\"\u003eelastic\u003c\/a\u003e fabrics is available in our online shop.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cspan style=\"color: #000000;\"\u003e\u003ca href=\"https:\/\/ikadepottee.com\/pages\/tutoriel-video-du-patron-de-couture-enfant-garcon-sebastien\" style=\"color: #000000;\"\u003eWatch the complete video tutorial for assembling Sébastien\u003c\/a\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/ikadepottee.com\/pages\/tutoriel-video-du-patron-de-couture-enfant-garcon-sebastien\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1051\/5902\/files\/1_6d055dcc-317a-4d04-85bc-f3221e75c388_large.png?v=1555662269\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/p\u003e","published_at":"2019-04-08T15:51:27+02:00","created_at":"2019-04-03T11:03:06+02:00","vendor":"ikatee","type":"Paper Sewing Pattern","tags":["Bain","boxer","Collection_Garçon","CSF PATRONS","maillot de bain","Niveau de couture_Facile","Niveau de couture_Intermédiaire","Patron_Enfant","Patron_Pochette enfant","Patron_Pochette hors duo","Patrons_Enfant","Pochette patron","Saisons_Automne hiver","Saisons_Printemps été","Symmetry","Tissu","Vêtement_Lingerie \/ Sous-vêtement","Vêtement_Maillot de bain","Vêtement_Pyjama \/ Homewear","Vêtement_Tee-shirt","Vêtement_Tenue de sport","Vêtements _Maillot de bain","Vêtements _Teeshirt","Vêtements_Tenue de sport"],"price":1700,"price_min":1700,"price_max":1700,"available":true,"price_varies":false,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":14738520801322,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"02.SEBA-IKPER032P","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"SEBASTIEN children's underwear and swimsuit paper sewing pattern","public_title":null,"options":["Default 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","id":71788903334275,"position":19,"preview_image":{"aspect_ratio":1.0,"height":1200,"width":1200,"src":"\/\/ikadepottee.com\/cdn\/shop\/files\/CouvertureSEBASTIEN-2.jpg?v=1780645822"},"aspect_ratio":1.0,"height":1200,"media_type":"image","src":"\/\/ikadepottee.com\/cdn\/shop\/files\/CouvertureSEBASTIEN-2.jpg?v=1780645822","width":1200}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch1 style=\"text-align: left;\"\u003eBilingual PDF digital sewing pattern. Boys aged 3 to 12.\u003c\/h1\u003e\n\u003cp\u003eUnderwear set with a tank top and briefs, or fitted swim briefs.\u003cbr\u003e\u003cspan style=\"text-decoration: underline;\"\u003eUnderwear set\u003c\/span\u003e: tank top with ribbing at the armholes and neckline, briefs with an elastic waistband and a lined front gusset between the legs. Back without a center seam.\u003cbr\u003e\u003cspan style=\"text-decoration: underline;\"\u003eSwim briefs\u003c\/span\u003e with center seams and no side seams. Fully lined for greater comfort.\u003cbr\u003eAn essential for a boy’s wardrobe.\u003c\/p\u003e\n\u003cp\u003eThe tank top can also be sewn for girls!\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cb\u003eThe pattern is also available as a paper pattern envelope delivered to your home (\u003ca href=\"https:\/\/ikadepottee.com\/products\/pochette-patron-de-couture-sous-vetement-et-maillot-sebastien-3-12a\"\u003esee the paper pattern\u003c\/a\u003e).\u003c\/b\u003e\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eSewing level: \u003cspan style=\"color: #999999;\"\u003eeasy to intermediate\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cb\u003e\u003cspan style=\"color: #bf9000;\"\u003eWhat you will learn with this pattern\u003c\/span\u003e: \u003c\/b\u003ehow to attach narrow ribbing to a tank top, enclose a briefs gusset, line swim briefs, and attach elastic to the waistband.\u003c\/p\u003e\n\u003ch2\u003e\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\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003eChoosing the right underwear or swimwear size\u003c\/span\u003e:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThese garments should fit very close to the body (especially bottoms, briefs, or boxers, as these are small pieces for which height is less important than the child's build and age....). It is strongly recommended not to choose an age above the child's actual age. For example, until a child has reached 7 years old, make the small swimwear and underwear pieces in size 6 years. If in doubt, it is better to choose the smaller size rather than the larger one.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eFabric suggestions:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003eUnderwear\u003c\/span\u003e: jersey, preferably stretch cotton (with elastane) + ribbing to cut into bands\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003eSwim briefs\u003c\/span\u003e: polyamide Lycra (knit swimwear fabric) + swimwear lining (Claudia swimwear lining or the same polyamide-Lycra fabric as the swimwear).\u003c\/p\u003e\n\u003ch2\u003e\n\u003cspan style=\"color: #bf9000;\"\u003e\u003c\/span\u003eSupplies:\u003c\/h2\u003e\n\u003cp\u003e3 to 4 cm wide elastic for the underwear briefs \u003cbr\u003e2 cm wide elastic for the swim briefs \u003cbr\u003eWoolly nylon thread and basic polyester thread \u003cbr\u003eMicrotex needles (or at least jersey or stretch needles!), Microtex is recommended for swimwear \u003cbr\u003eDouble needle for hems or a serger = coverstitch machine \u003cbr\u003ePlastic clips rather than pins for swimwear fabric\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cspan style=\"color: #bf9000;\"\u003esee the required fabric quantities in the footer tab \"supplies to prepare\"\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e \u003cstrong\u003e\u003cspan style=\"color: #cc0000;\"\u003eA selection of \u003ca href=\"https:\/\/ikadepottee.com\/collections\/jerseys\" style=\"color: #cc0000;\"\u003ejersey\u003c\/a\u003e, \u003ca href=\"https:\/\/ikadepottee.com\/collections\/bord-cotes\" style=\"color: #cc0000;\"\u003eribbing\u003c\/a\u003e, \u003ca href=\"https:\/\/ikadepottee.com\/collections\/maillot-de-bain\" style=\"color: #cc0000;\"\u003eLycra for swimwear\u003c\/a\u003e, and \u003ca href=\"https:\/\/ikadepottee.com\/collections\/elastiques\" style=\"color: #cc0000;\"\u003eelastic\u003c\/a\u003e fabrics is available in our online shop.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cspan style=\"color: #000000;\"\u003e\u003ca href=\"https:\/\/ikadepottee.com\/pages\/tutoriel-video-du-patron-de-couture-enfant-garcon-sebastien\" style=\"color: #000000;\"\u003eWatch the complete video tutorial for assembling Sébastien\u003c\/a\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/ikadepottee.com\/pages\/tutoriel-video-du-patron-de-couture-enfant-garcon-sebastien\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1051\/5902\/files\/1_6d055dcc-317a-4d04-85bc-f3221e75c388_large.png?v=1555662269\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/p\u003e"}
