Answer:
Well, their not very specific in the book, but here's what I heard:
Max: Jeans and a t-shirt or tank top
Fang: All black. But not goth. He's just quiet.
Iggy: Jeans, sneakers, t-shirt
Nudge: the fashionista. She always has something cute in her hair, wearing the latest styles.
Gazzy: little boy clothes
Angel: little girl clothes