dressing up for sex?

my bf really wants me to dress up in a plaid skirt and knee high socks and heels, borderline school girl uniform. i have the outfit but i’m so shy to put it on for him. i know he doesn’t wanna roleplay the “teacher and student” thing, he just thinks i would look hot. i’m willing to try it but i don’t have the confidence to do it and i think i would get embarrassed. any tips on how to get comfortable with it? i wanna surprise him with it one day.