I’m a little (bit more) confused about a news item today about the RAF. It’s in both the Daily Mail and The Sun, but I’ll write a precis rather than post links. 
It has been proposed by the top brass that servicewomen are no longer to be allowed to wear skirts on parade, in the barracks, or during public events. They must wear trousers. This is so transgender personnel don’t feel excluded. 
Now, I recall that some years ago, when initial training became mixed, males and females, the skirt had to be redesigned as it was too narrow for women to match the stride-length of the men. (And, indeed, there were concerns that making women match the men’s stride-length wasn’t good for their hips/pelvises. But never mind about that, eh?)
Apparently, in 2001, servicewomen were permitted to wear trousers on parade, and I guess that was because some women are tall and even the redesigned skirt wouldn’t work for them. I don’t think transgender was an issue 16 years ago.
Presuming that the transgender personnel in question are MTT, a skirt would be problematic for them, being generally longer in the leg. So, rather than redesign the skirt yet again (or, heaven forfend, go for a shorter stride-length) it’s much better to get rid of the one symbol that distinguishes the females.
Although I do think trousers are more practical for women (many servicewomen wore battledress during WWII), this seems all about the feelz. Apparently, there are no known statistics of the number of transgender people in the RAF, but it's reckoned to be "in the tens".