How to look good in pj's?

basicaly i am having a sleepover next week with my best mate and i know she will take loads of pic and propbly put them on facebook or something so before that i am going in to coventry to get my hair cut so i was wodering if anyone nos any nice pjs they sell in cov (mostly primark stuff) and any other tips on how to look good at a sleepover would be great thanks :D xxx