Need help with a costume

Some friends and I are looking for hillbilly costume ideas. We’re thinking overalls, corn cob pipes, straw hats, and so on. Any ideas or good places to look for stuff?

Also, a friend of mine just wanted to go absolute worst and wear a burlap sack, but I have no idea where I’d get one nowadays.

Time’s an issue so I’d prefer to get stuff locally rather than mail-order if at all possible. Thanks!