The pattern is McCall's 5248. Not much to tell, really. Pajama bottoms are unbelievably easy to put together... just four pieces and a tie. Not much fitting required other than getting the hem right. Speaking of the hem-- these ran LONG. I made the medium and shortened a little when I cut the pattern, but still ended up taking off another 1".
I'll probably make more of these to replace the ugly men's flannel that I normally wear around the house. This will certainly be more cheerful during the dreary winter months.