I've an article from the West End Gazetter from about 1915 which goes into the subject. I'll try to dig it up for you.

From memory (of the article - I'm not quite that old!), the cloth for Highland evening dress of the era would likely be black or bottle-green velvet, in a cut simular to non-kilted evening-dress, with tartan hose, buckled shoes and sgean dubh. head-dress would most likely be a 'blue bonnet' (Kilmarnock aka balmoral).

the "Bonny Prince Charlie" was considered 'new' in 1915

gotta go, the bairns are calling!

R