I'm 5'3 and 100 lbs and ordered an XS...it fits a little bigger than I expected but I absolutely love the look and feel of the material!love this sweaterFits true to size. Thin but not sheer.I do like this shirt, but it isn’t the most flattering on my body at the moment. I’m trying to shed my mom belly and I think it will look much nicer on me once I do. The material is lightweight and soft. It is almost see-thru, but not quite so I like to wear a tank underneath it. My biggest problem with this shirt is that it needs special attention in the wash. I put it in my front loader and the un-finished edges frayed quite a bit more than they started out as. I think this will have to be changed to a hand wash only shirt. Ugh, hand washing. I paid so much for it that I don’t want to ruin it though. To dry it, I find that it needs to be stretched to remove wrinkles and I even think it’s a shirt that would benefit from being pressed. That depends on personal taste, if you like crinkly looking knits. I prefer the look of this better if it is smooth. The contrast of the fine knit with the ragged edge just looks nicer to me that way. Anyhow, it is a pretty top. I think it would wear best on a slim build person. Not a fan of the high maintenance washing.