Vest made of 100% cotton.
This is one of the basic elements of uniformity recreating in practically any unit/army.
Made to measure with the best materials, the rear grip system is eligible, either with a braided corset-type cord (as in the photo) or with two cotton ribbons, thus simplifying this point.
The buttons can be made of tin, wood or covered in fabric of the same type as the back of the same vest. The three types of button were used in the 18th and 19th centuries in this type of garment.