Francesco del Cossa, Allegory of April (detail) (1476-84)
While there are no extant brache to go from, there are a number of images depicting underwear of various sorts. Mutande are shorter and tighter fitting, while brache are longer and somewhat looser.
I have used several different patterns for these over the years, but in this instance I chose to make two separate legs with a curved crotch seam and a rectangular panel between them. I added a casing and drawstring at the top.
The fabric I used is medium weight white linen (from fabrics-store.com). The construction was done by machine and the finishing was done by hand with waxed linen thread. The drawstring is a plain weave tape made from cotton crochet yarn on an inkle loom.
