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10. Luke and Lorelai from 'Gilmore Girls'
With the news of the Gilmore Girls revival, what better way to celebrate than by dressing up as Luke and Lorelai?

Lorelai: Jeans and a denim jacket will do it — the most important part of this costume is the witty banter, anyway.

Luke: All you need is a flannel, jeans, and a backwards cap. Done.