I bought a new pyjama pattern (Simplicity 2116) as I foolishly cut my original one to a women's size 8, and needed one for an extra medium man. I cut a medium, he is of for all intensive purposes of medium size, and they fit very well. Very baggy on the legs, but no more than pjs should be. I may even be borrowing them myself!
Hope you like, I'd do a pattern review but they are so ridiculously simple, and the same as all other pj patterns, that it would seem rather pointless.