I was raised in a temperate climate — New Zealand, to be precise — but it didn't take me long to grasp the absolute, primal importance of coats in much of North America. (Moving to Minnesota in January will teach you the value of a proper winter coat in, oh, about 15 seconds. Which is about the time it took the parts of my wet hair not covered by my hat to freeze one morning, oh happy Midwestern memories!) The problem is, as any card-carrying member of what Garrison Keillor called God's frozen people knows, is that the most stylish coats tend to be the least warm. Bunchy ski-wear made with Gore-Tex and studded with elastic drawstrings isn't really cute — and fuck me are those things expensive — but it does a much better job of keeping you warm than your average lined wool-blend shell from Old Navy. But if you're nonetheless drawn, for reasons of aesthetic preference or the necessity of maintaining a "professional" appearance, to non-sporty coats, there are some ways to trick them out. With basic sewing skills you can take any plain old coat and turn it into a piece of performance sportswear — on the inside.