Do not use woven calico for underwear muslins. Use cheap stretch mesh (20 denier) or an old t-shirt jersey. You must test the stretch ratio.
Use Adobe Reader’s “Poster” printing mode. Print at 100% scale (never "fit to page"). Trim one side of each tile and tape. For accuracy, measure the test square on the first page—it must be exactly 2 inches. Patternmaking For Underwear Design.pdf
Introduction: Why Underwear Requires a Different Patternmaking Approach In the world of fashion design, outerwear gets the glory, but underwear is the foundation. A poorly fitted jacket can look slouchy; a poorly fitted bra or pair of briefs can ruin an entire day. Unlike rigid woven garments, underwear relies on negative ease , stretch ratios , and delicate seam construction . This is why a specialized resource like Patternmaking For Underwear Design.pdf is an indispensable tool for any serious lingerie or activewear designer. Do not use woven calico for underwear muslins