This is a point I made in the comments of the last post, but I thought it warranted its own discussion.
What's the difference between Bugs Bunny and Bugs Bunny in drag?
Shoes, clothing, eyelashes, feminine accessories. In other words, the physical markings of femininity.
So, to stand without shoes or clothing or feminine accessories inherently makes Bugs Bunny male. It implies that the only way you can tell if someone is female is by the physical additions to their appearance and that the default sex is male. To be female means that first you have to start out as male, and then add the dress. There's a whole lot of psychoanalysis and penis envy theories that circle around this idea, but without Bugs Bunny.
I'm not endorsing psychoanalysis by any means, but just pointing out the similarities between this and the whore/man-whore language a commenter used.
Props to outcrazyophelia and Amelia for jumping on the whore/man-whore dichotomy language issue right away.
Look! A ponytail and a t-shirt! That one's a girl!
Props to my film professor for pointing this out.