I had planned to sculpt both shoes separately. However after sculpting the first shoe I noticed it was pretty symmetrical and could therefore get away with just casting the same one twice. This saved me a lot of time and hassle
I didn't put too much detail on to the shoe because I know there are no close up shots of it in the film.
I did add a kinds of sock shape/detail to the shoe just in case the trousers moved and reveled the armature.