From what I've read, elk is more durable than buckskin. I have gotten good service from commerial tanned deerskin, and a friend has used elk successfully. Both types need to be soaked, stretched as tight as possible on plywood or equivalent frame, and allowed to dry to avoid bagging and stretching in use. Both are soft and comfortable.
Elk tends to be thicker but deer can actually be stronger.
Therefore, to correctly replicate the look, comm'l tan skins should be used suede side out. This is also somewhat more durable. Such damage seems to be absorbed better on the suede side. I've about decided to have elk hide pants made for me. There are of course several period patterns for drop-front designs.