Yeah I was once in 13-14s myself, now at my weight it's a 10 maybe an 11 in the cheapies. Never thought I would be able to say THAT! Be so obese so long I feared I would die THAT Way, thank you God, thank you Surgeon, and most of all thank you strong woman spirit that has kept me following along with my Care Plan! Like the late Mary Tyler Moore theme song " I'm going to make it after all!"
If Spanx-type tummy control is what you're looking for, try FullBeauty.com under Shapewear. They have shapewear briefs that go all the way up to 8X. I have a 5X or 6X that fit me just fine at almost 400 pounds.
If you're looking for regular cotton underwear to accommodate your belly, I like Catherine's high-waisted briefs (the ones that come in a pack of 3). They have enough material to cover your stomach but the leg holes are cut low enough that they shouldn't sag under the weight of your stomach. I buy mine one size too large (they go up to underwear size 16, which I think is the equivalent of a 6X in pants), tuck the excess fabric under my "apron" and it keeps me from chafing without being too bulky. They're a bit on the pricey side, but watch for a buy 2, get 1 free sale.
