Soft Cashmere Green Sweater Shirt

Ordered several colors of this sweater on Amazon but they fit a little more snug than I prefer. They are stretchy, but I feel they run small. They say they are 100% cashmere and they are VERY soft and well made, but they don't have a fabric tag inside. The color is beautiful. This says it's a Large but I'm listing as a Medium because I'm a large and this is too small/snug.