Their shirts are super comfy despite being a tad too hipster-ish for my tastes, but these items look like they might be nice for golf and a somewhat cheaper alternative to the $$$$$ golf brands.

3 polos for $75?
http://store.americanapparel.net/2412pac.html

Slim 4 pocket pant

http://store.americanapparel.net/rsact400.html#i

I have a couple of the polos, and they are very comfortable and pretty thin, but I noticed sizing is inconsistent, I had to try on 3 smalls, and each one fit a little diferent, but its cheap stuff, and has held up well.