1. Get in shape
2. Don't wear cotton if the weather is even mildly threatening. You can't go wrong wearing wool.
3. Get in shape
4. You probably don't need any funky camo if you can sit still and not fidget.
5. get in shape
6. If you want cheap, idiot proof clothing, go get military surplus wool pants and then go to the local secondhand clothing store and buy the place out of wool stuff.