Card carrying member here. They started out with a t-shirt about
some of the guys they would see at the games here in the south.
They named the caricature McBubba.
Clan MacBubba was born when someone asked how to join.
They still own the rights to the shirt of X marks the SCOT.
The xmarks the scot.com shirt is not being made to produce a profit.
I think they even helped with a vendor for making the kilt pins.

I have most of their shirts.