No size found in label.  Looks like a narrow/slim fit.  Straps are adjustable.

Measurements:

47" from the top of the front zipper to leg cuff.

14" across front from armpit to armpit

approx. 28" waist

17" across front from hip to hip

15" zipper

27.5 inseam

Very well made.  Great condition! 100% Nylon 

Machine wash tumble dry

Will ship USPS Priority Mail