Clothing sleeveless tunic
A women's overgarment (ie it has an underdress worn underneath, but may have a cloak over top) which is shaped like a dress without sleeves. This garment may have evolved from surcoats knights wore to war.
One of the major sources for such garments is the manesse codex, a german bible illustrated 1300-1315. A copy of the illustrations from it can be found online at: [] This was the most popular time for this garment, but high cut surcoats were also occasionally worn in later times.
This garment probably evolved into the sideless surcoat where a much greater amount of the side of the underdress was exposed.