Tina Fey has been on The Late Show With David Letterman 20 times, and now that he’s retiring, she says she’ll never wear a fancy dress on a late night show again.

“I dress up like this out of respect for you,” she said from the guest seat Thursday night. “This is it, because…what, am I gonna put a dress on for Jimmy? That’s creepy, he’s like my brother.”

Since this would be her last time wearing something nice on a talk show, she decided to give Letterman the dress as a gift. He helped her remove her frock onstage to reveal what she called “almost medical” contraptions of shapewear that read, “Bye Dave / #lastdressever.”

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