I ordered size small in these Men's Cuffed Sleep Pants. I'm 5'4 and 110 lbs. I have the women's sleep pants that I like for lounging, but the men's pants so much better for sleeping because they are longer so they keep my ankles warm. They have the length and don't ride up when I bend my knees or move around. Also, they aren't a trip hazard because the cuff is perfect and the longer fabric rests on top of my feet and not past my ankles. I also roll the waist band over once and with no tag to show in the back, I think they look super cute in the butt and the roll takes up the slack in the crotch area! Rolling the waist band gives them a hip hugger look! They also don't have an opening in the front, so they don't gap open and they stay flat. The fabric is so soft and light weight that they will also work well as long underwear without adding a lot of bulk under jeans. I like these pants for sleeping much better than the women's sleep pants. Super cute and functional. Love them!!!