This may be a little bit of a tangent for this thread...but I there's a strange component in the definition because "who" determines what "femininity" is? I like long feminine hair. But I'm also clearly influenced by the 20-21st centuries that mandate what feminine hair and masculine hair looks like. If it were the reverse, and men were styling their long locks and women were shaving theirs short...would I want shorter hair instead? Same applies to clothing.
I also wonder just how many of us would be into this CDing thing, if we lived 100, 200, 300 years ago when life was much different....when we were more worried about whether our crops were going to make it, whether the cows were milked, etc, than we were about wearing women's clothing. Men/women of those generations were too busy had no access to Internet, movies, TV, etc. I think a lot of our desires have been enhanced and transformed by the modern world.
Perhaps these things don't really related to the original post. I'm just saying that the spectrum of Transgenderism/Crossdressing probably wasn't as broad. Transexuals may be a different matter, especially on the genetic side.
My two cents.