I am 5’9” and a size 12 and ordered a large. I couldn’t even get the sleeve on my arm. I’m probably an XXL in KJP clothing and not sure that would fit. I imagine KJP has a strong crossover customer with J Crew, LL Bean, and Ralph Lauren but their sizing is not similar. Disappointed and chose not to exchange because they have made it very clear they only want tiny customers. My three daughters and I are tall, fit, and muscular-we will shop elsewhere.