@mirewitch Yeah, but it's pretty hard to see how that wouldn't cause him even more stress. In the end he really wanted to study together with Mayu. I reckon he also simply wanted to study like almost all youths do, to belong to that majority group in that activity and not feel like his choices in life are limited because of missing it. In life you often need to sacrifice something to gain something else you want. Technically a school uniform isn't even supposed to be an element of control and suppression of individuality. It's supposed to be an equaliser. Rich and poor kids all look the same, wearing the same uniform. In the West rich kids would have expensive brand name clothes and bags, those from less wealthy families would need to stick to bulk or handed down items. Being from the West, I'm obviously not a fan of the "nail that sticks out must be hammered down" ideology (like those bitches telling Yuuki to dye his hair), but I also don't understand why anyone should let personal ideology or a desperate need for self-expression to overcome their own benefit in contexts where it's irrelevant. You go to school to study, to learn things you need for college/university and for life in general, for your own benefit. If that's not your first priority, you are automatically a problem student (with compulsory education, there obviously will be plenty of such problem students).
Anyway, I feel like this is beside the point. Yuuki is mentally healthy and has no problems wearing the male uniform, by the looks of it. He hasn't even got a gender identity disorder. His problem is his fear of not fitting in and his sensitivity to anything that might touch that uncertainty. It would be good if he could just talk about this stuff with someone. This should, really, be a minor problem for him. At least as long as nobody finds out his and Kei's part-time job...