Not fem though, but that wasn't the interesting kind of cool thing that happened.
I was at lunch, me and my friends mom went in while he parked. The host sat me and his mom, it was a minute before a waitress came over to ask about drinks. Though be before that she asked that She said "Hi ladies," To be fair I had my head looking down at the menu. And I have grown my hair long enough to put it in a pony tail. I had it down though, so you couldn't really see my face. Though kind of exciting that I was mistaken for a women.
I was wearing a Nike windbreaker jacket, women's stretch flared jeans(what i always wear), tennis shoes. Oh and had not shaved. Though when I looked up at her she didn't seem to flinch that it was actually a guy, but I assume she was just busy and so it didn't really matter to her, so she just moved on asking if we wanted anything to drink and she would be back to take our order.
That was certainly a big shock as I was in my normal male mode, which even with long hair wouldn't expect to ever be mistaken for a women.