I am 5'3"and weigh 125.  I ordered the size small and it fits pretty well.  What I don't like is that the fabric is quite thin, so it will be good in spring weather, but not in winter in the northeast.  It is definitely not a sweater weight item, if that is what you are looking for.  Also, there's the issue of the length of the sleeves.  Even the model, and models are usually very tall, has the sleeves hitting her fingertips.  Well, these sleeves are way too long on me.  I will have to shorten them myself, because there's no way I'm going to pay for alterations on this top. I stink at sewing and hate to do it.  It is clearly a design error to make the sleeves so very long.  I also feel that this item is overpriced, because of the fabric being so lightweight.  Nevertheless, it does look very cute, it's an interesting design, and so I am actually going to sew a hem on the each of the sleeves all by myself.  Wish me luck!