I would have no issue if she has gender dysphoria and identifies as a man and wants to wear male clothing. But she is just gay.. she identifies as a woman.. so she has to follow the formal women's dress code. The end. You don't get to swap just cus you feel like it. It would have been nice when I was in the Army to be able to follow the female hair grooming standards cus buzz cuts are boring.
Except there was no separate dress code for guys & girls until they found out she wanted to wear a tux. Even then, different dress codes based on gender are complete bullshit that should be done away with.