High school musical sing it on wii outfits?

Ok so I have unlocked all the songs and everything but im wondering how to unlock all the outfits for everyone on the unlockables under extras???
like where it says level 1 for Gabbie and all the otehr charactors and stuff how do I unlock the last couple pages

Hi,

If you get a grade of B or A- or A+.you will unlock clothes for Quickplay

High School Musical , well I played it with one of my friend's little sister lol but yes if you get enough stars .. or A A+ and sometimes B it will unlock clothes eventually .. you have to be I think in uh party mood and try different characters =]