This vest is a really cute idea for layering, so i ordered my usual size medium. and while it fit, it just added about 5-10 pounds onto my frame! ehhh the front just has this extra fabric that you are supposed to bunch up and then tie down, but it just made me look so bulky! sizing down wouldn't have helped as the back would have been squeezed in a small. it's a shame because it seems pretty well made and comfortable too. i'm 5'6", 140, and usually wear a 6 or 8.