What Causes Leggings to Become See-Through During Squats?

Leggings become see-through during squats when stretched fabric provides insufficient coverage.

Causes can include an open knit, unsuitable material, light colors, poor grading, or a fit that pulls the fabric beyond its intended extension. The problem may affect only certain sizes or colorways.

Diagnose the finished garment under consistent lighting and movement, then adjust material, pattern, or sizing as needed instead of assuming extra fabric weight alone will solve it.