No, I have spoken to the store manager (this after noon). She was very sympathetic. She confirmed that it was a temporary policy resulting from over £600 ($1200) worth of damaged ball gowns from a previous event. An that they weren't deliberately discriminating against transgendered. It was that this time of year they have a lot of "casual" staff and it was easier to instruct then to bar all men from trying on clothes. Apparently, she was made aware of my challenge to the SAs. To quote her, "I told them that in this case, she was almost certainly a transgendered person and would have been Ok". She told me to come back after xmas and the dress I wanted would be "available" in the sale.