What to wear? good impression? hot guy.?

SO im going out with my friend and this guy shes practically dating annnnnd he bringing his hot friend who i met once but idt he remembers me or anything. well hes frickin HOT. and this guy could get pretty much any girl and i wanna look good and make a good "second imoression" hahaha. i wear a lot of forever21 style clothes. were going to our youth group but its mad chill and we dont do anything, the majority of it is just hanging out with everyone. idess!? tips? THANKYOU.(: