A few comments on recent postings.
One thing I have noticed over the years is that people tend to take regular pole straps with a drop pole and yoke. This is not correct. A pole strap made for yoke and dropped pole should be about 8" long when folded and buckled, not much more, maybe a little less.
Lisa Singer has tended to use a style of Yankee Britching , the type that comes from the martingale, up to the crupper and back down the other side. Look at her marathon pictures and you may see what you are looking for there. When I have used collars, I put a fleece lined strap with steel rings around the collar, then hooked the pole quick release through those rings as well as the ring in the kidney link, just as a back up.