True to size small. Set is 40% off! one of my faves I’ve had for several years. washed & dried countless times and it’s still perfect. it’s a waffle material. top is what I had on with the jeans! ended up swapping my jeans for the matching pants for a walk to the park this evening. I love that this set is so versatile — weather you want to wear it together or just the top alone with jeans is adorable!