Urban Outfitters has that style! They're pricey usually, but if you wait, every once in a while everything on the sale rack in stores will be an EXTRA 50% off. You can get cardigans, rompers, crop tops, etc for $5-$10, and jewelry (lots of layered necklaces) for $1-$5. Also, I think you'll really like Tilly's? You probably already know about it though, haha, sorry! But they also sometimes have great sales! I wanted a couple months for a shirt I wanted that was normally $30, and got it for $1.60 including tax, and free shipping! Happy shopping!
Grunge isn't a fashion, it's an attitude. Back in the 90s most fans were skaters, so buy clothes that are cheap, practical and durable from thrift stroes and army surplus shops. Try a used pair of jeans with holes in the knees, a flannel shirt of the type worn by construction workers, a pair of Doc Martens or Converse sneakers, and a faded graphic print T shirt Back in the 90s I owned a shirt similar to this. I still have a black and white one that I wear for shooting
