Don't buy cheap. It'll disappoint you in short order and/ or fall apart. Been there, done that.
Sometimes you can get old, real surplus gear "cheap". Even if it isn't the hotshit stuff the cool kids are wearing, it's the best option because it won't be single-stitched together with hopes and dreams.
If you collect a bunch of matching surplus gear from a specific period, well hey, that's a loadout thing!
Scour your local surplus store. Do a bit of research and rummage through the odds and ends bin.
Otherwise, save your cash. Start a swear jar. Spend the best portion of your money on high end eye protection and footwear. Everything else is just function or fashion.