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Thread Count Fabrics

Sebastien Underwear Set and Swimsuit Pattern | 3-12 Years

Underwear set + swimsuit pattern for boys 

Underwear : tank-top and shorty and a swimsuit boxershorty
Underwear : Ribbing at armholes and neckline, fancy elastic at waistband, gusset at shorty front with full lining and enclosed seams, and dart at gusset. No seam at back, side seams.

Swimsuit : seams at crotches, no side seams, elastic into waistband, full lining 

Pattern comes in both French and English. A video tutorial is also available on Youtube in French with English subtitles.

Skill 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 at swimsuit.

Material suggestions:

Underwear : jersey with or without elastan, ribbing.  
Swimsuit : jersey in polyamide or polyester with lycra (around 20% of lycra). For the lining : use main fabric or special polyester moss crepe

Trims : 

  • basic or fancy elastic 3 to 4 cm wide for underwear short
  • elastic 2 cm wide for the swimwear shorty
  • fully voluminous polyester thread (multi-fibers) and polyester basic thread
  • special needle for jersey and evene microtex needle for swimsuit is better
  • double needle for hems (if you do not have one, it is possible to replace all the points made with a double needle by a zig-zag stitch) - prefer the special needle for jersey 
  • Wonder clips (better than pins for the swimsuit fabric)
  • double training foot for sewing machine

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