Been using an Uncle George wallet holster for my LCP for just under one year. The leather has taken a bit of a "shape" now so as to allow the tell-all two straight sides print to become apparent. This happens when the unsupported corner folds in toward the thigh while the corner/sides held away from the leg by the gun keep their "flatness". I fixed this by gluing leather scraps to a height of just over the thickness of the gun itself in the corner that folds. This keeps all four corners (and all 4 sides) away from the leg (and more flat) to keep the "wallet" look rather than having the slide/grip edges being the only ones holding up away from the leg.
Most people wouldn't notice the difference between a wallet and the two sided "shape", but those who "know" could very well notice...
BTW, and we all likely know this but I'll say, er, type it anyway: Pockets are lint traps. Disassemble and clean out your lil' buddy often!