Before she was prim and proper on “Mad Men,” Alison Brie enjoyed testing the California Institute of the Arts’ optional clothing policy.

As a student, she would jog around campus in nothing but her sneakers.

She says “I would use it more for comedy purposes … Every now and then I would just throw on my tennis and like, take a jaunt … to exercise my rights.”

She adds “If my roommate was having a bad day and I wanted to make her laugh to feel better, I would sort of pretend I was gonna take a shower and then I would sneak outside and like hang from the tree outside our window like a monkey.”

We know a lot of guys who would’ve loved to be her roommate then.

J-Connection: Alison Brie, born Alison Brie Schermerhorn, is her Jewish. She even began her acting career onstage at a Southern California JCC, fully clothed we’re sure.