I have a Darien L Jacket and it is tight. I have a Darien XL Jacket and it is loose so I need an in between size. I contacted Aerostich and asked what sizes are the Large and extra Large in numbers and explained l was tight and xl was loose. Their response was to order what my normal jacket size is. I don't have a normal jacket, that is why I was asking the question. Years ago at a rally I talked with a gentleman who asked the same question at aerostich and was lucky enough to get an expereinced salesman who gave him exact numbers but I cannot remember what they were. I do remember they were odd numbers like 41 47?? Any help would be appreciated.