I love love love these pajama pants.  I ordered a size up because I have a fractured leg and muscle damage, and they fit around the brace perfectly so I assume the sizing is probably accurate.  They are so comfortable, and soft and wonderful and I highly recommend them.  You can't go wrong.  The fabric is much softer than tee shirt material, but about the same weight.  I washed them once with no shrinkage.  The drawstring waist makes them adjustable for a lot of sizes.  I'm ordering a couple more pair.  Perfect.