I can get some silk much less expensive, but the kind of silks that have a good hang for kimono are much thicker and more luscious. For the length of fabric, regardless of the wearer's height you can estimate a sleeve and body floor-length kimono to need four yards for the body (two front, two back), and four yards for the sleeves (two front, two back per sleeve, but only half width so you get both sleeves from the same four yards). That means if you want a trailing length, you need it for the front, back, and sleeves, so that would be about another four yards, plus a little extra for a wider collar and underside facing on the bottom for practical construction reasons.