Historical costumes are often a LOT more expensive to do than fantasy, because if the fabric isn't right it's painfully obvious. She wears good quality Scottish Tartans and plain wools manufactured the same places. In the US these fabrics usually run $40- 60 a yard.
While the costumers for the show have taken a few liberties, it's mostly really accurate, especially the construction of her skirts. By the way, her waist isn't cinched that much, she's wearing an undergarment called a bum roll which widens the hip but creates the same silhouette.
Are you mentally prepared for period accurate costuming? if yes, you want to be financially prepared as well, it's a bear.