In Scotland, the home of the kilt, it is illegal to upskirt. The law does not distinguish kilts from other skirts or mention the gender of the victim. When I go out fully dressed I dress very smartly in appropriate places and no one has ever photographed me with a mobile phone or camera - as far as I know. When I dress as a man in a skirt or dress I would expect it to happen more but it has not. Maybe Scots are just more tolerant and polite - a man in a skirt or a fully dressed crossdresser is just part of life not something to record and put on social media. It is not something I worry about. The only exception is the guy sitting at the entrance to the women's changing room playing with his phone. He is bored and might just take a picture of the guy carrying the dresses into or out of the changing room. I have only seen this once and simply waited until he had left.