The pants are very soft and comfortable. The tie-off for the waist is non-elastic. The knit top, while thin, is also comfortable and does not bind or twist while I am sleeping (a huge consideration for continued use). We'll see how well this holds up over the next several months. Overall a good purchase.

UPDATE: JULY 5, 2012

While the shirt and pants have seen a lot of use since I purchased them, the pants have held up very well. However, the top button of the shirt does not stay buttoned because the material has stretched. Also not mentioned in the original post, the pants have two side pockets to put loose change, keys, whatever. I've received several complements on this sleepwear. Still a good buy.