"8-yard" and "5-yard" are rough general approximations. The actual yardage will vary and is dependent on several factors including the size of the wearer, the sett size, the pleating scheme, etc. Pleats on an "8-yard kilt" will be somewhere in the neighborhood of 1/2 - 5/8 inches wide, while on a "5-yard kilt" they will be more in the 3/4 - 7/8 inch range.