Would it not be healthier for the horse, and less inviting of opportunity for pinching or galling, to simply better manage exercise and feed programs?
As harness was explained to me, by a pretty good harness maker, it is more a question of proportional fit, and where the buckles end up, then cost of leather that determines the length of girth.
Adding a second set buckles is one thing when the horse is 17hh. However, when the entire girth of the horse is less than a hefty man's belt, there isn't room to allow for 1" of buckle, strap and holes, plus another buckle, wrap straps - or quick release buckle(!) and an elbow. (Having said that, if it's VERY temporary, i.e. horse on diet and exercising every day, I did see someone using a cut off stirrup leather for a week)
Spend the money and get a girth that fits, or diet, exercise and don't let him pudge out again!
Does anyone know if there are girth extenders for a mini harness? I am buying a harness that will fit both of my minis, but one of them has put on a bit of weight.
Thanks