For a woman I am probably exactly the size of an average American guy... Unfortunately, I am not shaped like a guy, so when I tried on guys rack drysuits I had plenty of sizes that seemed "right" but ended up feeling all wrong. Too tight on the hips and bunching all over the shoulders in most cases, often way too much fabric around belly too. The extra material around shoulders/armpits especially in thicker (neo) or stiffer (like cordura, DUI's CLX type) drysuits would be uncomfortable when it squeezes in wrinkles onto you.
DUI is one who pays a lot of attention to women's needs I am told. I tried their sizes and was fairly happy with their rack sizes. I got a great deal with custom job though and went with that. I am happy how mine was done. I know women who dive Bare too and seem to be happy, a lot of the ones I know are pretty skinny though but that might just be a co-incidence. I have not tried Bare. After having a custom suit it will be pretty hard to twist my arm to go back to a rack suit. At first I could have considered but having compared to a personal cut it would be hard to accept the compromise.