Underarms/arms are billowed like a bat wing so chest measurement would be of little help in terms of matching your measurement or that of a jacket you own so best measurement is probably waist which stretches just slightly to 46″ maximum with just slight elasticity. Measuring against a straight cut zipper jacket waist you might own would be a good comparison.
Pant elastic waist stretches to 40″ maximum and has a drawstring waist to tighten. We’re sorry but there is no readable size to provide. Zippered cuffs and multiple pockets. Made from parachute quality nylon.