What to get my 12 year old friend for her b-day? ?

Hey my friend is turning 12 and I'm trying 14 I'm an 8th grader and she's a 7th were really popular at school were kinda plastics and all we were ia HOLISTER and Areopostal and justice but I don't no what to by her and it's a pool party with CUTE BOYZ. Shoul I buy her a shirt jacket swim sutte what?Help I wanna be a good FRIend