Actually it is contemporary Highland attire.

I'm not sure if the kilt worn by the musician in the first post is wearing a solid green kilt or just a kilt with a lot of green in the tartan; that is unclear from the book.

A long while back, someone criticized the wearing of a watch with white tie attire when I brought up the description of Adam's outfit (second post).

Still seems strange that there was no description of a silver cantle and sporran in that outfit.