I'm with Iolaus on this. Unless you are wearing a tank or 5yrd traditional WITHOUT a sporran, you are almost certainly not going to show anyone anything. It is the very gifted man that the weight of a sporran can't keep his kilt down.

And those who wear tanks or traditional kilts without a sporran need a talking to. Unless you are tossing a kaber, I can't think of a reason why you wouldn't have a sporran.