Prototype pair of breeches we are working on. This is NOT the final configuration, but a test of pattern and fit. These will fit to a modern jeans size of 34. Actual measurement is 36.5 inches inside waist. This fabric is very heavy, black (darker than it appears in photos) and is of 90% knit cotton, so it has some stretch. These are really stretchy, but the waistband is a woven cotton, so it won't stretch. However, the calves should fit pretty much any size. This pair has leather patches on the inside of the thighs.
Please note that the final product will be 100% cotton and will have cloth patches instead of leather.