What can i wear with AMERICAN FLAG HIGH WAISTED SHORTS FROM TOPSHOP?

Im going to a party tonight and its on in a kind of play ground :P Its an indoorr playground for kids but you can rent it out for parties at night and its great fun! The main point is i cant wear a dress because of the slides and ball pools so i have to wear shorts or a play suit. I have these which i bought yesterday but what would i wear with them?http://www.google.com/imgres?imgurl=http://i.ebayimg.com/05/!CFLyV1QBWk~%24(KGrHqV,!i0E1NRK3gB)BNUVFt68v!~~0_35.JPG&imgrefurl=http://cgi.ebay.co.uk/Topshop-American-Flag-High-Waisted-Shorts-W28-UK10-/260734458370&usg=__WaSVgg5GRUymU72XQd0H-guXPYQ=&h=169&w=300&sz=11&hl=en&start=0&sig2=1sggzFAqNFfm4zQElt9TNA&zoom=1&tbnid=Uou57q3gDqhJLM:&tbnh=104&tbnw=185&ei=o1_rTZatBqLf0QG2ro2FAQ&prev=/search%3Fq%3Dhigh%2Bwaisted%2Bamerican%2Bflag%2Bshorts%26hl%3Den%26biw%3D1259%26bih%3D788%26gbv%3D2%26tbm%3Disch&itbs=1&iact=hc&vpx=139&vpy=115&dur=3671&hovh=135&hovw=240&tx=187&ty=76&page=1&ndsp=26&ved=1t:429,r:0,s:0&biw=1259&bih=788