Depends what you're looking for, but these are some options I carry in my store

https://www.amazon.com/Charades-Womens-Pirate-Costume-Blouse/dp/B01CY5S3W0 (XL fits up to 4X)

Corset Story

Inter-modencalifornia.com

Medieval Collectibles

https://www.amazon.com/Leg-Avenue-Plus-Size-Peasant-Costume/dp/B00UM4E4GU?source=ps-sl-shoppingads-lpcontext&ref_=fplfs&psc=1&smid=ATVPDKIKX0DER (order one size up to be sure, it can be a little small around the stomach)