You did nothing wrong. Your money is as good as anybodies. If they don't want your money, fine. Move on. Find someplace else to shop. As far as I know, it's not illegal to shop trans gendered.

If I were you, I'd go straight to the head of the Fashion Bug. They probably wont do anything. But at least mention it to them. Make them aware of who we are, and that we aren't going to be discouraged.

Good luck love!