Floor length prom dress, I had the zipper in the back removed and replaced with corseted style lacing so it's very adjustable for various sizes.
The sticker says 3X but I was about 220lbs when I wore it to my homecoming and it fit beautifully, and even again a couple of years later when I wore it to prom after gaining a few more pounds thanks to the corset lacing back.

The bust is formed with a couple of stiff bone rods to keep the shape. A type of plastic or fiber rod I think, so it acts as a built in bra which was very handy.
In case you can't tell, it's not strapless. It has thin spaghetti straps to hold it up, but I don't think it would matter much if you cut the straps off if you wanted since it holds up nicely on its own anyway.
Only worn twice and it has been clean. I think there's one tiny little nick from my bracelet catching around the lower maroon on the left, but it's tiny.

Asking $100 OBO. Paid around $400 from the big dress shop in the college station mall, but I'll never wear it again so flexible on the price.