On sporrans, a pipe band can never go wrong with horse hair sporrans. They just "go" with bagpipes, giving a nice visual balance below the belt to the angle of the drones above the belt. I've always thought that pipers wearing small sporrans look top-heavy, but that's just me. A long hair sporran really does the trick.

I notice you didn't mention anything about headwear. Does your band wear any sort of hat? If not, that's an excellent way to make the look completely new without doing a total revamp of everything else. Glengarries seem to be all the style amongst pipe bands these days, but I personally like the old-school look of Balmorals.