Tart's Harness.. don't let the name fool you.. this is a beautiful, classy harness for all ponies out there, and in red for the first one but other colors are available and will be on the vendor soon, as well as another version of this line and a dress harness.
A harness that's sturdy enough for any pony girl (and boy, perhaps) to wear and still look beautiful in their tack.
Available on SL exchange --
http://slexchange.com/modules.php?name=Marketplace&file=item&ItemID=216103
http://i148.photobucket.com/albums/s2/psyche_knot/clothing%20pics%20sl/harnessred.jpg