I ordered an xs in this color and a size s in two other colors. The xs fits just as I like it, which is a big more on the fitted side without being too tight. I wish I ordered xs in all three colors. These are super soft and can be worn for casual summer days, exercise, or to sleep in. For reference, I am 5'3, 122, with a smaller chest size. If you are more ample in chest size, the small might be the better option.
Rating: [5 of 5 Stars!]