The whole time I have been riding horses (about 11yrs) I always thought that a size 48" girth was the average size. It was what I was first taught to use and the size girth I have, which fits a wide variety of horses perhaps not on the idea billet hole...but it tightens snugly.
But now that I am sort of passively looking for a new girth on ebay, I've notice that a LOT of the used girths are 52"-56". I'm just wondering if this is because of the trend towards larger horses (warmbloods) or if it's something else all together? What size girth do you use? It's just move of a curiosity thing than anything.