Tartan on the Bias?

[Woodsheal]

Can't recall the date, but if you check the painting of the battle of Culloden, where Highlands are in close quaters with English soliders, you'll note some of the Highlanders wearing jackets and vest, cut on the bias - pretty sure these were painted earlier than 1812 ...

You are referring to the famous painting by David Morier, which was done shortly after the '45 Rebellion. Morier is best know for his accurate paintings of the various British army regimental uniforms of the period.

And, yes! Bias-cut tartan coats do seem to be in evidence here;