This is my favorite coat. It is so comfortable, extremely warm and looks nice. I wear size 8 UK and 4 US and a size small fits well, though the shoulders are slightly poofy and the waist is snug, I think an X Sm would be too small. Very well made. Note there is a florescent yellow line at a hem inside the coat that might show when it is unbuttoned. I don't mind it, but I think it would be nicer if it was black like the rest of the liner.