Ehm.. Maybe another take on this:
If you áre transgender, you may cross-dress with the motive of feeling more feminine. Taking hormones makes you feel content, more yourself; more feminine. With this, the need to prove yourself feminine by dressing up feminine might dissipate; it might simply diminish the urge to put on women's clothing, because it takes away some of the need to prove yourself (to yourself).
Me; I'm still sitting at the uni-sex clothes stage, and when I get some spare cash, I'm going to try my luck buying some cheap women's clothes. (The shoes are what worries me most, though.. I'm júst out of normal women's size, and shoes are expensive enough as it is... Luckily, army boots go well with skirts.

)
But.. I'm also a bit of a tomboy, really. Yes; I like skirts and dresses, but I like them to have at least a bit of a roughness to them. Not neat and shiny, please. ^_^
I don't know, but the thoughts of dressing like a woman might become less pressing if I were to be on hormones.. Because at the moment, I'm driven mostly by insecurity. There's nothing sexual about it.