Is that the long shawl worn over a white linen gown? I think that the formal Scottish women’s wear is absolutely wonderful.
I think that's rather posh kit.
The white sark is the basic garment, but it's like your underskirt and blouse in one. Over that we wear 'a pair of bodies'...which is two pieces of leather cut to shape and laced on. It's not so much a corset as a support and something to pin brooches onto. If they're made of lined wool, and have shoulder pieces then they're sort of like lace on waistcoats....and skirts, heavy linen or wool or both, skirts. Jackets if they could afford them.
The Arisaid goes over the top. Belted round the waist and the top comes up and over your head. It's wide enough to comfortably wrap a baby and keep him close and secure.
When I was very little, and Granny showed me how to pleat mine over a belt, "Girls without sisters could look very untidy", she said

and then I was told in no uncertain fashion that I mustn't be seen wearing it outdoors, except maybe in the back garden.
There's social history here.
Y'see, women sat in kirk with their arisaids pulled up over their heads for warmth, to cover their hair, maybe to feed a baby, but the Ministers couldn't see that they were paying attention....and in the past the sermons could last hours. Preaching the word meant just that, but folk were expected to listen and pay heed.
So, they said that wearing the arisaid was disrespectful, and in no time respectable women wore coats, jackets and the like instead. The arisaid remained as the shawl women wrapped around them and the baby, but I do remember hearing folks tut at one mum who came out to the fruit and veg van while wearing hers. Not done, kind of thing. I was just at school so that'd be mid 1960's.
Different times.
