What should my friend wear in our show??

I've mentioned how I am in high school musical 2 playing gabriella, but my friend is also in it playing Sharpay. I got some good answers so we thought we'd ask about her costume ideas! It's in a few weeks time and she just has to wear the one costume for the whole show. It just has to be something recognisable as Sharpay and something fairly cheap as we are a bit strapped for cash! Also, she's size 8/10 and we live in England so no American sites please! Thanks please answer! x