My boyfriend Wants to dress me Up in a sexy school Girl uniform?

Okay well Im 18 and my Boyfriend is 23, Today he asked me If he bought this sexy school girl uniform and A pink thong ,Would i wear it for him before We have sex, I didnt know what to say But i still said yes, But Why does he want to go to so much trouble for this its a stupid idea, When he can just Save his money? Its so weird ha