Or is it actually more restrictive, and sexist, than the press release is making it sound?
Considering there are four options for women (five if you include the hijab) and only one for men, it does indeed look quite sexist.
Jumpsuits are very popular in general (and it does say they're only initially for ground crew) as are other potentially impractical items like high heels; as long as nobody is forcing you to wear something, if you want to choose style/preference over practicality, what's the actual issue?
It's like when you go to a restaurant, there will undoubtedly be some options that you don't like - most people just instantly rule those options out without any drama and pick from the things that they do like.
Uniforms don't tend to be beautiful or stylish, but that's sort of the whole idea of them: nobody will be judging you on your own personal style when it's the same thing that everybody else working there is wearing as well.
I also don't get the complaints that they haven't asked every single employee. It's completely standard to have a representative focus group; do you really expect them to ask thousands of employees and hope to accommodate every single person's preferences?
You could always go and work in B&Q, where everybody has to wear a men's polo shirt and men's trousers and like it.