I don't have Before The Kilt but I do have
which is wonderful because the author presents the actual evidence by category (written accounts, surviving examples, imagery) so that the reader is in the same position as the author.
I always prefer authors that are heavy on presenting evidence and light on drawing conclusions, rather than the other way round.
BTW I don't think you can point to a certain point in time and say "before this time the kilt didn't exist, and after this time it did." In my opinion there was a period of unknown length in the Highlands during which the mantle was an undifferentiated garment which at the wearer's whim could be thrown over the shoulder like a cloak (the
brat of old Ireland) or wrapped around the waist (a proto-great kilt).
Just why the fashion began of wrapping the mantle around the waist in the Highlands, and not in Ireland, who can say.
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