If you are a tall person looking for pajama pants, you've found them. I am 5'10" 135lbs. I bought a Large out of habit, so when i tie the waist up around my belly button they still pool a bit at my feet. The drawstring is completely functional, which is great. I probably could have gotten away with a medium but I like a little extra room.

A note about the blue plaid- it's more of a dark lavender color. The fabric is very soft, but also very thin and feels a little cheap, hence the 4 stars. Overall, these are fairly well made and I'm ordering two more pairs in the other colors offered just because of the long inseam these pants offer.