I watched the same recently. I don't know how accurate that portrayal was as far as the indigenous cultures, but I did find it cool that many of the natives, while not wearing kilts (still about 700+ years to go for that little fashion moment), there were sporrans.

Can't remember where, but I remember reading an ancient tome that pre-dates the kilts regarding the "Gauls" as wearing their belt pouches in front of their bodies instead of to the side.