>>8903317I used a coat from ebay intended for Gambit figures for mine (though I made mine before the updated design). It has a wire in the coat to make it posable.
Here's the listing I bought from:
https://www.ebay.com/itm/SU-TC-GB-BN-1-12-Brown-Wired-Trench-Coat-for-Marvel-Legends-Gambit-No-Figure-/233237589298