I know what you're asking and I can assure you of my findings with these great feeling pima cotton pj's. I'm a solid L/PL in almost every item, I'm 5'2" and weigh in around the 165 lb mark. Broad shoulders, long torso, a typical 58 year old waist and hips plus I can't stand clingy clothing, especially my sleepwear. Yet, I've consistently bought a M in the EF for Garnet Hill pajamas and have always had plenty of room to "lounge" and sleep comfortably. You can go with your "gut" on these. If you usually wear an XL in clothing, I'd absolutely recommend trying the Large. You're going to love them!