Hello Xucilod, if you give us the exact body size, our tailor will make the coat to fit your body size, since this is a coat, so our tailor will make it larger size than your exact body size.
Or, you can simply give us the coat size you want, then our tailor will make the coat size as you ordered. (add a remark message like "This is the coat size I want." Then our tailor will aware of it.)