If there was a There, I Fixed It for the equestrian set, FarmWife would be a rising star.
Witness, a homemade crupper of old bungee cords, billet guards, and assorted hardware salvage:
A goat harness of old carseat seat belts and extra polo wraps:
An English wintec saddle with western leather breeching, kluged together with old halter fragments providing D rings where there were none:
Of course, FarmWife's ingenuity is limited by the strength of her featherweight Singer when it comes to oversize sewing projects—for this reason, and for safety's sake, we'll be looking for a commercial beta harness when that time comes.
It's not for lack of trying, FarmWife. You've done alright with the small stuff.