Quote Originally Posted by KiltedTurtle
The gentleman that was showing them around the chapel was kilted.
It's my understanding that the Historic Scotland guides have been able to wear kilts as part of their uniform for several years now.

scotsman.com article

Since Rosslyn Chapel's renovations have included funding by Historic Scotland and the Rossyln Chapel Trust, I wouldn't be surprised to find a guide or other expert in a kilt around the chapel.