There are a lot of benefits to buying vintage. There's the price—an older piece will often cost you a lot less than buying new—and there's the exclusivity of finding a piece that no one else will have. Not to mention, the sheer enjoyment from the search and the satisfying thrill of discovery when you stumble upon something truly extraordinary. But thrifting, as the kids say, can be a bit daunting if you're not used to the process. We caught up with Cale Margol of Gap's Los Angeles-based 1969 denim design studio for some trade secrets.