We generally size from a US/Canadian size 12 and above depending on the brand's size limits.
Most plus size brands go up to a 3XL - US 26/28 at present, but some go farther. Every product page has a size chart or notes to help you figure out your best size.
Soon, we'll attach sizing links for each brand we sell on this page.
If in doubt - send us an email at firstname.lastname@example.org , we are always happy to help!