I buy a lot of things strictly for the materials. Pillowcases make quick and easy dresses for little girls, or tops or minis for adults. Sheets can be used to make women's dresses or skirts. Mens button downs can be used for just about anything. One of my favorite skirts was a 30 minute sewing project from one of those. I also butcher the largest gowns I can find. TONS of fabric on those. Pullover sweaters can be turned into cardigans by just grabbing a pair of scissors and adding some bias tape. You can repurpose just about any item of clothing for very little oop.
THIS is why I need a sewing machine......you're making me want to head to the thrift store NOW :)