The 5% spandex makes for a very tight fit. Order one size larger if you have breasts and/or toned/average size arms. I wear a size medium with a low-mid C cup. I could close the jacket at the waist easily but it looked ridiculous across my chest...way too tight. I reordered a size large which took care of the over all fit across the chest (with room in the waist), but the sleeves still hug my arms giving the appearance that the jacket is too tight. Since the jacket has a great texture and is so cheap, I'm taking it to a seamstress friend to let out the sleeve seams for a more tailored fit.