God I buy this in all colors! I'm 5'8", 155 pounds and have a long, athletic build. Based on the reviews I ordered a medium although I usually wear a small. The medium is a little loose, but I wanted it for comfortable everyday wear. I also like that there is an elastic band around the ankle so I can pull it up and down and adjust the length. Like all the other reviews, you can definitely wear this or unbutton it! I'm obsessed! If you want a sexy/slim fit I recommend taking your normal size or going down a size. If you want a more comfortable fit, go up one size.
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