A quilted and padded, or stuffed leather or cloth, garment worn under chain mail in the Middle Ages and later as a doublet by men and women. A military tunic, worn especially in the 14th century, made of leather or thick cloth, sometimes padded; it covered the trunk and thighs, and was originally worn under the habergeon, to prevent chafing or bruises, but was sometimes used as a defence without other body-armour.
A sleeveless coat or jacket of mail or scale armour, originally smaller and lighter than a hauberk. A short, sleeveless coat of mail.
A long tunic made of chain mail. A piece of defensive armour (originally intended for the defence of the neck and shoulders but already in 12th and 13th centuries developed into a long coat of mail) or military tunic, usually of ring or chain mail, which adapted itself readily to the motions of the body.
Over time Habergeon and Hauberk seem to have become more or less interchangeable.