Riddle me this, Batman!

I have a green dress that has a sort of black checkered pattern on it. I wore it to work recently and one of my coworkers told me I looked like Jim Carrey's version of the Joker. I repeated that comment to one of my girlfriends and she was outraged. "Your coworker is an idiot," she exclaimed.

I felt so vindicated.

Then she said "I mean come on! Jim Carrey was the Riddler! NOT the Joker!"