I get almost all of my clothes from thrift stores, though nowadays that's usually not much savings since many thrift stores are charging MSRP or higher.
I'm picky, but I go often, so I find decent stuff at least once a month for pants, shoes, coats, etc. My taste in shirts makes it difficult to find at thrift stores, so that's the one piece of clothing I usually buy at outlet stores.
Belts is something else I'm particular about, since the cheap, crappy belts most places sell fall apart in a few months on me, so a few years ago my wife got me two expensive, full-grain leather belts, and they've been all I've needed ever since.