This coat is really good looking. Nice color and lines. However, it runs small. It says it's an 18/20. I'm a 16/18 so it should fit. Despite being within the listed measurements, it is super snug especially across the chest, to the point wear I almost can't zip it up. The next size up would be way too big (according to sizing and measurements).

UPDATE: I decided to purchase the larger size coat because I loved the color and the cut and figured the biggest size available (22/24) should fit. It is still quite small. Despite being THREE SIZES larger than what I normally wear,it is still slightly snug across hips and chest, though it is wearable. I definitely recommend ordering a bigger size than you would normally wear, and if you like coats a bit on the roomier side, don't bother.