I searched high and low for this specific topic. I hope this isn't a repeat.

What criteria define different sporran as being day, dress, semi-dress and hunting? As far as I have been able to discern, a day sporran is just leather with a flap that buttons over the front. A dress sporran is furry and has a cantle over the top. A semi-dress sporran is usually furry but has the flap over the front. For the hunting sporran, I have seen examples labeled as such though I am uncertain as to what distinguishes them.