Having to put a heavy mail all day already feels really uncomfortable for a guy. I can't imagine how uncomfortable it is for women, especially if they have big breasts. High-ranked figures may have her armors customized to their liking, but how about lower-ranked soldiers?
How many women do you think were going to war and wearing armour?
War was almost entirely a masculine endeavor and, while there are a few examples of female warriors and commanders, the further we get into the High and Late Middle Ages, the fewer women we see in combat (outside of rebellions and the defense of their own homes).
Prior to suits of plate armour, any women who needed to wear armour would have worn the same thing as the men: a hauberk (chain mail shirt) if they could afford it, leather armor or whatever else they could scrounge up if they were of less means.
Joan of Arc had an inexpensive plate suit specially made for her, which fit her well, but otherwise almost all stories of women in plate armour are just stories, not based in reality.
Correct me if I'm wrong, but wasn't plate armor very expensive, and pretty much custom made for the owner, regardless of sex?
I didn't think the rank and file fought in metal plate or armor suits.