Women's shapewear briefs (L) NWOT

I bought these from Amazon and I used their size guide which told me I was a large. However, as soon as I pulled them out of the package I knew there was no way these were going to fit. So they have never been tried on and I still have the original packaging. They're a lovely blush / nude color in a delicate mesh lace, with stays at the top to prevent the waistband from Rolling down. Waistband (which sits high) is approximately 12" across, and they are approximately 15" across the seat.