Many brands stop their women's range early, then add a token largest size by scaling the whole block up uniformly. That gives you a jacket that fits the chest but hangs at the shoulder, or trousers that fit the hips and gape at the waist. A real curvy fit is graded with a different shape, not just a bigger one, so the chest, waist, and hip grow at the rates a curvier body actually follows.
Where the gear binds, the armor moves. A jacket pulled tight across the bust drags the back protector sideways, and trousers straining at the thigh push the knee armor inward. Fit and protection are the same conversation here, which is why a piece that merely zips is not the same as a piece that fits.