Another plus-sized girl chiming in here. I have seen up to 3XL but agree with those that said you have to check out each garment. Standard T’s run a little roomier, fitted women’s tops fit more like junior sizes as Wishy said.
That being said, I have never had a problem finding things at WDW that I like and that fit, I just have to be a little more choosey. You can always try stuff on and if you get back to the resort and find that something doesn’t fit the way you would like you can return it with your receipt.
Btw, Wish, those are super cute PJs.