Dressage shads do have weighted tails (to keep from flapping) and are usually lined in a leather or vinyl so that the dirt and sweat from the horse can be easily wiped off. Also style-wise, I think most dressage tails are more squared off whereas hunters are more rounded.
The only thing the government needs to solve all of its problems is a Council of Common Sense.
O-o-o-h-h...hmm. A local tack store has some dressage shads at a reasonable price and was curious if you could just change the buttons (didn't know about the weighted tails). Thoughts? I'd love to have one but I'd only really get to wear it once a year or so.
"Radar, the man's ex-cavalry: if he sees four flies having a meeting, he knows they're talking about a horse!" Cptn. BJ Hunnicutt, M*A*S*H Season 4, Episode "Dear Mildred"