I've noticed that Stillwater advertises that their kilts have belt loops "that actually fit a wide kilt belt!"

Now I was told that if a kilt does have belt loops, they're intended for the sporran chain, and that the belt is mainly decorative anyways so it doesn't need loops.

So whats the deal? Are you supposed to put your belt through the loops, or is it just something people have started to do, or what?