i think my brothers gay

Ok so im like 98% sure my oldest brothers gay and i want to like talk about it with him because he is not the kind of person to tell his family ANYTHING. Like once he legit signed up for a football team and didnt tell us anything untill one of his friends casually metioned there last game . How do i bring this up with him without making it weird?
also if u wanna know WHY i think he is its because
1: this one is really weird but he always wears skirts? like he started wearing them in middle school and now nobody around us thinks it weird but yeah.
2: He's always super like touchy with this one guy friend and maybe theyre just close but uh like i dont know how to explain, if you saw it you would understand
3: Once he came home at like 2 am and when i ask where he was and he said that boy i mentioned aboves house and i could see like hickeys on his neck

idk maybe this is an awful place to put it but i live in a very straight white neighborhood so i dont have anyone to ask about this stuff also i really hope i wasnt offensive in anyway