~~ wut do i ware to "hangout night" w/ my science teacher??? ~~?

hi im 12 yrs old n my sceince cl mr. walkins told me that i get to come to his house n eat pizza n play video games for a new "hangout night" hez gunna start doing for the kids lols.... wut do i ware, do i hav 2 ware school uniform or casual jeanz????