Once you get your sizing dialed in on a few "nice" brands (thrift stores are great for trying several brands, just go in knowing which ones you're looking for)

Once you get your sizing dialed in on a few "nice" brands (thrift stores are great for trying several brands, just go in knowing which ones you're looking for) you can wait for sales & seconds (shoes) & used (thrift stores, ebay) & overstock and such. Most are rip-offs at full price but are priced about right (still much higher than fast-fashion, but not insane) at 30-40% off, which isn't that hard to find, and are great deals under that. Now that I know my sizing in a few reasonably consistent much-better-than-fast-fashion brands I just wait for their sales, order a few pieces a year online, and the clothes show up. It's great.