I purchased both a Medium and a Large, and ended up keeping them both.  The medium is perfect for wearing to work without looking sloppy, while the large is great to lounge around the house.  I bought this to replace an old J Crew cotton "Artist" 3/4-length sleeve shirt that had started to dry rot after several years.  While this is a full-sleeve shirt, and not cotton, it will suffice.  The construction is a little odd - the white neckline is a different piece of fabric from the striped portion, and you can see the seam pretty well in person.  The shirt does have bust darts, which for a busty woman is a god-send for not looking like a potato in clothing, but was a surprise when I put the shirt on.  Overall, I'm ok with it, but may continue my search for a better replacement for my beloved shirt.