Snowsuit (noun)

1. A suit made of warm, waterproof material worn in cold or snowy weather.
2. A one-piece suit made of warm and waterproof material worn to keep warm in cold and snowy weather.

Origin:

Snow + suit.

Examples:

1. The child was bundled up in a snowsuit.
2. The snowsuit kept him warm while he played in the snow.
3. The snowsuit was designed for extreme cold weather.
4. He bought a snowsuit for his trip to the mountains.
5. The snowsuit was made of high-tech material to keep the wearer warm.