I chimed in early in this discussion and it seems to have drifted around a bit as well as becoming unnecessarily terse. In reading all of the various posts, I thought this one stood out to me as ringing true, as I perceive it;

Quote Originally Posted by jkdesq
Kilt/skirt
shirt/blouse
trousers/slacks
underwear/panties
Many articles of clothing have a "boys name" and a "girls name". Kilts are no more "skirts for men" than shirts are "blouses for men".
There is a conotation that a blouse or skirt are female attire and a shirt or kilt are male attire. While it is acceptable in our culture for women to dress in men's clothing, there is an objective bias against men wearing items that are seen to be within the female domain. This is clearly the reason many men in kilts take offense to having a traditionally maculine garment refered to in a distinctly female context.. particularly when it is being done by someone that knows the difference and is intentionally making the distinction in an effort to raise ire.