I can’t stress enough the importance of literally detailing every single measurement. If you do, you will get exactly what you ask for. If you don’t, you will get an approximation based on a size range that trends larger than you might expect (you can see this in the published size charts). This exercise requires no stone left unturned. The bonus is that Shawn will absolutely listen, and abide to your requests. Spell out every detail. Knowing how to do that is a process of self discovery. Use a template. Measure yourself, measure other jackets, take pictures with a measuring tape. A little front end leg work goes a really long way!