This is a vintage M65 Fishtail Parka made of cotton nylon material in OD Green color. It has a long jacket/coat length and a relaxed fit. The parka features a zip closure and a fishtail design. It is a medium regular size and was likely used by the US Army or Marines during the Vietnam War in 1972.
I’m not incredibly well-versed in military gear so please feel free to ask any questions. See photos! Thank you again!