@JumboWheat01 He should try to exchange uniforms once with Mayu. Not sure if Mayu could button up fully, but it would be nice to see nonetheless. You'd think they would be interested in it, themselves.
@Nolonar Nah, I expected a boys' uniform. The school wouldn't allow anything else, and Yuuki knows from a personal experience he'd get bullied if he tried otherwise. His new top priority is to stay beside Mayu, so his own taste in clothing is secondary. That's what love does to you.