16.2hh and 17.5" saddle - wanted a 17" cos i had lost weight, saddler didn't have one
I do know of a v short-coupled 16hh horse where the rider was clinically obese, saddler had to recommend an 18" saddle to fit the rider, didn't do much for the horses back though
Both my boys are 15.3/16hh with a 16.5" saddle. I very nearly ordered a 16" as a replacement after it was stolen because the 16.5" seat is too big but my leg wouldn't have fitted.
My sister's 14.2 (short coupled connie) came with an 18" saddle!