The process for making a perfect fitting leather jacket at this point - it could not be more simple. I really mean that - the 7 measurements or so are all that is needed, but there can't be any fewer steps either, we need those 7 bits of data, any fewer would be insufficient, any more is relaly unnecessary. That said, it takes all of 1 minute to get these measurements done on your part, and we'll turn out a jacket that fits. Complicate these steps, and it's gonna go wrong. I have cut the patterns for these jackets myself, I've sized for hundreds of jackets, Charly has sized people for hundreds of jackets, we know what we are doing - you should take our advice. Human bodies are not so different that you need to add three inches here and take away 2 there - the difference between stock sizes in OTR clothing are usually less than an inch, size to size - the differences are very small.