Originally Posted by
hockeystl
I wear 35 or 36in waist on most pants and have never been anywhere close to needing a seat belt extension and I've flown every DL craft (along with virtually every sub-variant) with the exception of the Saab prop.
But unlike your belt, the seatbelt does not go all the way around your waist. Try taking off your belt and then holding the ends on your sides like a seatbelt. 35" to 38" sounds about right (I can't say I've ever thought to measure though).