Sebastien Underwear/Swimsuit (Ages 3-12yrs)- Ikatee

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Underwear/Swimsuit Set Paper Sewing Pattern & Guidebook

Versatile tank top and boxer shorts that can be used as underwear, pyjamas or swimwear. Ribbing at armholes and neckline and fancy elastic at waistband. Front shorts have a gusset with full lining and enclosed seams, and dart at gusset. No centre back seam on shorts. 

Sewing level: easy to intermediate

What you will learn with this sewing pattern: how to sew ribbing, how to assemble a gusset with lining and enclosed seams, how to sew elastics, how to assemble a full lining as a swimsuit.

Material suggestions: 

Underwear : jersey, cotton elastane or ribbing.  
Swimsuit : polyamide or polyester jersey with lycra (around 20% lycra). For the lining use main fabric or polyester moss crepe.

Shop Recommended Fabrics


  • basic or fancy elastic 3 to 4 cm wide for underwear shorts
  • elastic 2 cm wide for the swimwear shorts
  • ballpoint needle for jersey or microtex needle for swim fabric
  • Wonder clips recommended for swimsuit fabric over pins

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