To be clear, the only reason I don't consider it like, Actual Canon is because Phoenix and Maya is a cute enough ship that I genuinely do like it. But like... textually, it's unambigious that Something is going on between these two boys. "You've saddled me with unnecessary... feelings" is just straight up a line that is said for real by Miles.
The robes have to be loose to accommodate all body types, and a camisole would end up ripping. It's fine... and also we see something far far worse later.