Mommy rarely dressed us alike (when she did it was because someone gave her matching outfits - she never bought them herself!) But when we were dressed alike it was almost impossible to tell us apart! But not for Mommy - she had a little secret that she never told anyone!
HOWEVER, if we were wearing shorts then anyone could tell us apart easily. JL has a birthmark just below his right knee on his inner calf. See it here: