As a reasonably frequent (straight male) passenger, I don't like the current 'sexy' style uniforms.
It is degrading to women to treat them almost exclusively as being there merely to decorate the world of oversexed pasengers. It also does not inspire confidence to see staff who are supposed to be there to help wearing uniforms which would make it hard for them to run or slide more than two yards.
Smart well made trousers and smart trainers would be both attractive, comportable and practical, and I am willing to bet that most stewardesses and passengers would opt for something like that if offered.
Men will still look, but it will not be so obvious from behind.