Suspenders are an interesting invention. Santa Claus and grandpa were pretty much the gateway introduction for me. My parents tried to gloss over them in their bedtime story reading, but no detail ever escaped my attention.
I like to speculate how and where things were invented. Life was pretty simple once upon a time and "necessity was the mother of all invention" they say despite the unkind things written about her on bathroom walls. She was just a single mom doing the best she could with a really unruly kid. So I can imagine that someone was having probs with the whole belt concept. Either they were "the belt goes through the loops" challenged or "the little metal thingy goes in one of the holes" challenged. OK, maybe the motivation was that they could not find a belt big enough for someone but were people ever really that fat before McDonalds, potato chips and coke? And besides, it is just as likely that they were invented for a really skinny guy with no butt to keep his pants from sliding off.