For Halloween, Target has a whole bunch of "costume" onesies and footie pajamas out right now. There are women's pajamas that have character hoods and go up to size XXL. They come in a huge selection of styles such as tigers, unicorns, owls, leopards, and pandas.
Some of these have other fun dress-up features as well, for example the Owl has wings sewn on and the Leopard has paw gloves attached. These are NOT Kigurumi because they do not have the dropped crotch -- they really look like huge versions of kids' pajamas.
There are also, in the Junior's sleepwear section, a smattering of licensed character pajamas, including Batman and Superman PJs that come with little capes attached just like the toddler versions!
These pajamas are only out for the Halloween season (as I found out when I tried to buy a pair last November) so check them out while you can!