Bear with me for using my memory rather than actually checking the facts, but I think all were gentry (as figheadair described), and one was described as a "blueish philabeg" so perhaps it was a solid color material, which would have been a way around the Act.

By the way, figheadair, thank you for the letter of Erkine in 1748. I was not aware of that. Access to material like that wasn't possible 30-40 years ago on this side of the pond. I haven't followed much of clothing in that period since that time, and I'm guessing there must be more available on-line now.