1. The Workmanship The first thing I check for on patterned handbags are the seams. A counterfeit doesn’t have the care and craftsmanship put into it that a real designer bag has, which means the fabric and pattern won’t line up at the seams. In fact, that’s the quickest way to determine if a Louis Vuitton product is fake: The patterns of real Louis Vuitton products always line up along the seams.