Beautiful Vintage Condition! The inseam is short, but the rise is also hangs really high. I cannot find a material tag; it feels like a rayon/polyester blend. Please see the photos and measurements below.

When laying flat, the waist measures14.5 inches.
The hip area is almost non-measurable (it flares out super wide). 
The inseam (crotch to the bottom of the leg) measures 25 inches. 
The rise (waist to crotch) is approximately 15.5 inches.  
The opening at the bottom of the legs measures 29 inches.
Shoulder seam to shoulder seam measures 17 inches. 
Shoulder seam to hem measures 51inches.  
This jumpsuit is in beautiful vintage condition and comes from a smoke-free home. 
Thanks for looking!