Yes! RedLaser!
To be honest I don't find it works that well for clothing, but it works brilliantly for a lot of other stuff. I FINALLY found a B&M store near me that sells the ink I need for my "special" printer after months of frustrated searching. I'd like for it to include more mom & pop stores as well, and just include more B&M stores in general (they include a lot of online stores). But it is definitely helpful and accurate. It's not a free app though, but I have more iTunes gift cards than I know what to do with, so I just went ahead and bought it. The best use I have found for it is with drug store items.