Nina Amir has written a very relevant post about costumes for boys in ballet at her blog My Son Can Dance.
This is indeed an area that can benefit from creativity! I've been in conflicts with directors quite a few times over boys'/mens costumes. I've seen arguments about whether boys/men should shave their armpits or not. Or shave off a moustache because of one piece of choreography...I've seen people resign over it.
It is not easy!