I've seen a lot of people mentioning Howie Nicholby's 21st Century Kilts.

Now, I have the RHCPipers's last CD in my hand, and on the back of the booklet they thank their sponsors: "Slanj (website-adress) - for the great kilts and image"

So, I don't mean to be a wiseguy or something, but I think they are not (always) wearing TFCK when they perform.
I haven't seen the lightning kiltpin on their kilts either...

I must admit, I thought they were wearing TFCK's too at first, but... I'm not so sure anymore