I'm sure every question has been answered at least once...maybe twice on Xmarks, but I couldn't find the answer to this one. In another thread, McMurdo showed off two very fine sporrans. You can see them here.

I love a nice sporran and will have to get one someday, but as I was looking at McMurdo's sporrans, I wondered why 3 tassles?

I figure the tassles are there for pure decoration; I can't think of any purpose they serve. For fur sporrans, my first thought were they were the feet of the animal supplying the fur, but then we're down one foot. Even sporrans made of synthethic materials have 3 tassles. After all, any number of tassles can give a sporran symmetry, so why three?