Clothing sleeveless tunic
A women's overgarment (worn with an underdress underneath, but may have a cloak over top) which is shaped like a dress without sleeves, with straight openings along the sides. This garment may have evolved from surcoats knights wore to war.
One of the major sources for such garments is the Manesse Codex. These surcoats were most frequently worn by women in the first half of the 14th century. It evolved into the sideless surcoat where a much greater amount of the side of the underdress was exposed.