The boots were custom made suede ankle boots with matching suede puttees (leg wraps). The puttees were wrapped over the bottom portion of the pants, up to the knee. I've seen some costumes where people try and cheat with a pre-wrapped puttee, but it never looks right. The only way to get the look accurate is to wrap the puttees just like they did for the real costume, it's a bit time consuming, but very much worth the effort. Plus they stay in place without falling.