Don't dress to undress

This is used when you ask someone on a friendly date, and want to let them know that there is no chance that the two of you will be having sex afterwards.

Sally: Hey John, wanna come with me to the Canadian High Commission tonight? They're screening a Canadian film there.

John: Uh, cool. What's the setup there, like what should I wear?

Sally: I'm not entirely sure, but don't dress to undress, I need to be somewhere else at half past nine.

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