I wear a lot of men's clothing also, for pretty much the same reason as you do. Easier to find Men's clothing in pure cotton, more comfortable fit around the shoulders, allowes for more liberty of movement, and men's clothing (shirts, pants, jackets) tend to have more pockets - important to me since I don't carry a purse.
A lot of times, whatever is available in women's clothing is dependent on the latest popular style. The only way I keep up on style is by noticing what everyone else at work is wearing. (this pant/thigh latest fad is horrendous!! LOL).
If you would like to soften your look and start trying on more feminin styles, I would suggest you start with clothing stores that specialize in outdoorsy clothing and casual/sport styles. Many of the styles will copy the men's clothing (since the clothing needs to be comfortable and practical), but with subtle details that play down the masculine look and make things more feminin, like smaller collars, more subtle pockets, and other little things.
Another thing I do is shop at second had clothing stores a lot - I try on stuff I'd never thought I would like, and realize I look great and feel good in them. Since the thrift store clothing is dirt cheap, if I end up not really liking my choice and not wearing it as much as I thought I would, no biggy - it only cost me a few dollars.