Tuxedo Vest size 4X, 55" waist or chest

I'm looking for a men's tuxedo/suit vest or a woman's vest with similar styling for a costume. It needs to be black, gray or charcoal. Pinstripes are OK. I'd prefer the kind with a satin back and tie. I'd prefer the shorter style that ends at the waist instead of the hips. No wool please, but any other material OK. Used/worn is just fine!

Should fit 55" in waist or chest. That generally translates to a size 4X. Since this is for wearing once as a costume, I'm looking for cheap.