So I bought a North Face Thunder Down jacket online recently. I'm a tall (but skinny, obviously) runner: 6'3"/175. The large fits great in the sleeves and length, but the body is just way too roomy for me. It negates how warm the jacket is because there are so many gaps and dead air pockets. I have tried on a medium in the same jacket and the body fits great, but then it's really short, especially in the sleeves. I love the styling of the jacket. For any of you who routinely get clothes tailored to fit, do you think a tailor would be able to alter this jacket to fit more snugly? What sort of damage might that cause to the down?