I'm thinking some are not so much wearing their kilts longer but lower.

When I was at the Virginia Scottish Games a couple last weekend I noticed quite a few who wore the kilt around their hips vice their waist (as they would a pair of jeans), thus covering their knees and making it appear the kilt was actually being worn longer.

Like MoR, I'm one of those who thinks it looks a bit trollopy. But on the other hand, they are wearing a kilt so I suggest we not be too hasty in our judgements. Perhaps as they wear a kilt more often they will learn how to wear it properly.