Edit: I took off two stars as two buttons fell off after the second washing.

Edit 2: And I took off the last star because it bled blue dye for 4 washes before the color stopped fading.

I like these pajamas.  I think the knit quality and the fabric thickness it just right.  It is a double knit with cross stitches...it looks indestructible.  The flannel is medium density and will work well at room temp and a bit below.  Note, it isn't thick flannel--this is not cold weather gear.

I was really irritated by the size of the sleeve openings.  They are enormous (I took off one star just for the sleeve openings).  You'd have to have wrists like a silverback gorilla to need openings this huge.  However, I did find a workaround.  I put a rubber band around the sleeve cuff and with some clever folding it is now acceptable.

Also, it is worthy of note that the top has a very low V neck opening.  This is fine if I'm lounging around but in anything even slightly more formal I'd need a tee shirt on or this looks odd with my chest hair busting out the top (the model in the picture conveniently has no hair).

On sizing (I got a large):

I'm 5'11", about 33-34 arms, 39 chest, 32 inseam and waist.  Sleeve LENGTH is good but the openings, as I mentioned, are huge.  The overall fit is definitely baggy/flowing so don't expect a snug fit here if you are my size.  The pants are actually a bit snug in the waist which I found odd as my waist is only 32ish.  The first wash made a pretty big difference.  The whole set shrunk maybe 1/2 a size.