As @nuttynutifications pointed out in an old submission about Attack on Titan, the Humanity’s Defence Force uniform is not only practical, but actually, well… uniform, regardless who wears it.
This section of the video by
Super Eyepatch Wolf takes the point further, by stressing how important it is that the costume suits everyone, regardless of gender, age or bodytype. The lack of gratuitous fanservice or double standard makes the army (and characters belonging to it) relatable to everyone.
Saddest part of it is that AoT still remains a rare noble exception to the “ladies must look completely different, because if no boob how woman?” rule.