Wondering this for some years now...

[Myca]

http://www.collegehumor.com/video/6550847/female-armor-sucks

[Smeg]

It because of production problems back in the middleages, when so many woman warriors rampaged around the place, the blacksmiths simply could not supply all that iron! So they cut down some of the pieces, shamefully due to the church's influance, the worng ones :P