Outlander Wardrobe and language

[Calgacus]

They have on linen sarks, waistcoats and Highland Jackets, both made in wool.

Aha!

I have worn linen shirts on the hill before, but only in good weather, not adverse weather.
I think this is the key to your actors' comfort. Cotton performs very poorly when cold and wet, and can be positively dangerous in the Scottish hills. I'll bet your crew were largely wearing cotton or synthetic materials next to their skin.

This encourages me in my plans to take a more traditional approach to dress in the hills, so many thanks.

Oh, and kudos for taking the effort to use linen where cotton would probably have been cheaper and easier.