I really like the effect of the piping Sara - it shows off the horizontal panels beautifully. I'm currently experimenting with a horizontal design but with a waistband, no darts, and 3 panels above and below the waist. It's working out surprisingly well (comfortable and no wrinkling) however the cf profile is not flat - the waist is being pulled to the cb more readily than the ub and bottom. It means the silhouette from the front view is not very hourglass. Incidentally I place the cf on the straight grain, not the cb. More experiments required!