The Floorwalker

Trying to avoid capture by a store detective, The Tramp switches identities with a floorwalker - unaware he is a double-crossing embezzler on the lam.

Mirror image gag
The mirror image gag
Max's mirror image gag
Five years later, in 1921, a broken mirror sets up the gag in Max Linder's Seven Years Bad Luck.
Marx Brothers' mirror image gag
The gag is most often associated with the Marx Brothers' 1933 Duck Soup, which also uses the broken mirror setup.
Three Stooge's' mirror image gag
The Three Stooges also used the broken mirror setup in their 1944 Idle Roomers, but with a twist: wearing completely different clothing, the mirror image bears no resemblance at all.