The item is a vintage Body Glove 6.5mm Step-In Jacket, Wetsuit Top Size LM. It has a cool vintage vibe!

The jacket is made by 6.5mm heavy material, great pre-owned condition, heavy duty YKK zipper works great, some light storage soiling. The jacket can be worn separately or with the Long John (purchased separately). Worn together, the Long John and this Jacket system provide lots of protection over the body's core for the coldest conditions. 

Approximate Measurements
Length: 34"
Width At Waist: 15" (X2)
Shoulder: 18"

Armpit to Cuff: 19"
Inseam: 4"