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Long johns, also known as long underwear or thermal underwear , are undergarments used in cold conditions to stay warm. They are essentially tight pants, or rather, brief underwear but with legs that extend down to the ankles. There are two schools of thought when it comes to wearing long johns. Some guys prefer to wear them over their original brief style underwear, while others throw aside their briefs and wear the long johns directly as underwear, with nothing on underneath. Someone wearing their pants without underwear is said to be wearing them commando . A person that wears their long johns directly on them, without keeping their original layer of undergarment on underneath is wearing them long john commando .
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