If you want these pants to fit like leggings order a size down. I think they are made to be more comfy than tight for exercise. I love them but they have stretched out a bit. I am 5'6 with soccer player legs (big thighs) to give some perspective. I usually order a Small in leggings because I like them tight, so definitely order down if you don't want these loose!
Jillian recommended this style