How Are Racerback Sports Bras Graded Across Cup Sizes?

Racerback grading must coordinate bust volume, torso proportions, strap geometry, and band fit.

Sports bra support depends on the complete structure, including cups, underband, straps, fabric resistance, and pattern fit. A single component or fiber percentage cannot establish the support level; evaluate representative garments on the intended wearer group during the relevant activities before final approval. Do not enlarge every component uniformly.