Louis Vuitton is the most counterfeited designer out there. They have produced many different lines of bags throughout the years; canvas monogram, epi, vernis, damier azur just to name a few of their outside finishes. With all of this, authentication can be overwhelming. So, we put together an easy beginner's guide to authenticating Louis Vuitton bags. Enjoy! When authenticating Louis Vuitton purses, there are many details to study: leather, stitch trim, inside lining, hardware details, monogram pattern/alignment, d-rings, etc, etc.