Let it go "Frozen" freaks ... Elsa and co. have been dethroned by Caitlyn Jenner in the Halloween costume popularity game -- although they're hardly targeting the same audience.
Several costume companies tell us the replica of Caitlyn's corset, worn for her Vanity Fair cover, is hands down the the most in-demand getup this season. A rep for Wholesale Halloween Costumes says they haven't seen a craze like this since "Frozen" last year.
The rep says they're sold out after 1,000 units of "Call Me Caitlyn" flew off shelves back in August, and they haven't been able to restock for Halloween. Soooo ... Elsa might have to be your plan 'B' this year, fellas.
Note to male purchasers of either costume: Please, please wax or shave.