ON TRACK?
I did this just last weekend - Im not usually a Walmart shopper, but I remembered them selling plain plus swim suits a few years back, and since all my old suits fall off, and will need a new one will in a couple of months too, I figured inexpensive might be good!
Turns out they had nothing the required size that wasn't inappropriate, but I did walk out with an xxl pair of work out pants from the regular sizes. I even went and checked the plus sizes but could see they were so not the right size anymore! It was a nice moment!
(Of course stretchy fabric forgives many sins, I'm not out of plus quite yet for regular woven fabrics :) )