U.S. Navy cold-weather trousers in olive green with a quilted lining. Navy Department contract N140-62236S-38697, which is part of a 1950s Navy clothing contract series, so they're likely from the 1950s. The label doesn't give a model name.

Tagged size Medium.

Condition is fair. They've been used a lot and have oil stains, including a big one on the back of one leg (pictured).

From my grandfather's collection.