American Apparel has the best genderqueer clothing of any chain. All of their clothing is either unisex or "women's", but that's just a recommendation of course. They show most of their clothing on both female and male models, and a lot of their models are very androgynous.

This is my favorite marketing video from any company EVER. It's titled "unisexy":

http://www.youtube.com/watch?v=JuFScWaqjCc