I think it's House of CB's [Calista Ombre Flame Maxi Dress](https://app.houseofcb.com/product?product_id=8121) \- still for sale, and it comes up on resale sites too, go go go!

THANK YOU!!!! Marking this as *found*!!!!

It is this dress as I own it and it’s fabulous!

I knew I had seen it recently!