For the 1900 view, showing the view at the start of the era, I'd HIGHLY recommend:
The Kilt & How to Wear It by The Hon. Stuart Ruaidri Erskine (1901)
http://giftshop.scottishtartans.org/books.htm

Other ones I find interesting are:
All About Your Kilt by Bob Martin

For the time before that:
Old Irish & Highland Dress by H. F. McClintock