I just received a pr of these pajama jeans in a sz xl. I am just over 200 lbs and 5'9". They fit but my complaints are that they are too short (above ankle) and the waist only reaches above my hips. I HATE that! I much prefer that my "waist" fit at my real waist. Otherwise they fit everywhere else and are comfortable.

I just bought an XL and weight 160 - 165 and they were a little big. I think they will shrink some though.

Get whatever size they recommend. The waist should be tight and they will be harder to get on because of that, but if you want a fitted jean then get your regular size or size down even

I have not purchased these but I'm sure the fitting is the same as all cotton spandex clothes. My personal approach is this...say you wear one of the fallowing pant sizes... 6 thru18. Med. is your best bet for sz. 6-10, large for 11-14 and x large for 15-18. Over that would be an xx large. This sizing seems to be pretty accurate for the regular/average style/fit. Hope that helps...but unfortunately we can't do anything for those darn short cuts of 30"-31" inseams. I wanted these until I saw the high rise inseam...31" come on! They need to start them out at 32"...they can always be hemmed...or make a shorter people pair... Right?