Because society. Yes, it’s a full sentence.
Peronally, I don’t care what you wear, which colours you like, if you paint your nails or if you apply makeup, etc. Do your thing and don’t let people tell you what you’re allowed to do and what not. Don’t limit yourself.
Kings back then wore shoes with heels to appear taller, wore wigs, dresses/long skirts and jewellery and powdered their faces. Why does society think that’s only for females? It’s ridiculous. Honestly, it reeks hypocrisy and nothing else.