How to Prevent Leggings From Becoming See-Through
See-through leggings are almost always a fabric weight (GSM) problem, not a design problem — specifying a higher GSM (220+ for nylon/spandex) and requesting a squat/stretch test on your actual sample before bulk production is the most reliable prevention.
Why Leggings Become See-Through
Fabric fibers spread apart under stretch — at low GSM (fabric weight), that spreading is enough to let light through, especially over the seat and thigh area during movement like squatting. This is a fabric-weight and construction issue, not something fixed by color or print alone (dark colors can mask it slightly but don't solve the underlying fabric problem).
The GSM Threshold That Matters
Nylon/spandex leggings at the lower end of the typical range (around 200 GSM) are more prone to see-through under stretch than those at 220-230+ GSM. See our GSM Guide for how weight ranges map to use cases.
Construction Choices That Help
- Double-layer gusset/seat panel construction adds opacity exactly where stretch is highest - Four-way stretch fabric with good recovery (not just any "stretchy" fabric) holds shape better under repeated movement - [需人工核实] Specific ClothReady construction options (e.g. double-layer panels) — confirm availability and cost impact for your order
Test Before You Commit to Bulk
Don't take a fabric's GSM number on faith — request a squat test (or do one yourself) on your actual physical sample before approving it for bulk production. This is exactly why the sample step exists — catching a see-through issue on 1 sample piece is far cheaper than discovering it in a 500-piece bulk order.
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