To me the Kilt looks strange without the Sporran. More like just a skirt. UK's don't have one but there are still studs in front. I reckon something needs to be in front, just to offset the expanse of flat apron.

Besides, you can always keep nifty things in a sporran. Hand grenade, pepper spray, Hankie, Live Cobra, - just the usual things.......(Huh? What?)