I have a pair of the Small size of pajama jeans and they are a little big on me so I decided to purchase the X small. The length on the Xsmall was so much shorter than the Small. They were floods on me. When you look at them on line it says that the length is the same as the Small it is not! So I sent them back.
So if you are short and skinny the Xsmall will work for you.
 I really love the pajama jeans they are soooo comfortable. I shrunk the size small and they fit pretty good now. All of my friends were shocked when I told them that they were Pajama Jeans because they look really good.