I have been wearing the kilt for over ten years now, and have worn my only sporran- what you would call a leather day sporran- to both black tie and casual affairs. Given the material poverty in which MANY clansmen would have lived during the heyday of the Highland clan system, I have no quams whatsoever about declaring my lowly status as a poor and common clansman (and not to mention the fact that I am a starving artist). I think it's certainly nice if you can have the "proper" sporran for every occasion, but I feel that this tradition is based on commercial exploitation of our heritage.

Just my two sense worth...