It's hard not to look like a lost schoolboy when wearing a raincoat so praise be for Danish brand Rains. Its line of colorful (and not-so-colorful) waterproof coats come in a range of clean, long-line cuts and tailored-looking shapes. Some of them are short crops too, just in case the whole "jacket down to your mid-thighs" thing isn't for you.
Neons, camo and sleek offerings in black or beige all make for interesting ways of ensuring your festival look is shower resistant. Also, they are easily cleanable, so if your antics get super messy, you can hide the evidence.