Basic guidelines for what clothes to wear at a music festival?

The last festival I went to I made sure I was well prepared! Definitely something waterproof such as a jacket, as weather is so unpredictable. Wellys are also a good idea, but if the weather is nice I would take some floaty dresses that are comfortable, or any other clothing you find easy to wear. Take outfits that you don't mind getting dirty or that are easily washable. Hoody's are a great idea if it's a bit nippy as well as cardigans. Just remember the suncream, my friend burnt all her back and couldn't lie down to go to sleep in the tent at the last festival we went to!