waist·coat 
(wĕskĭt, wāstkōt′)
(wĕskĭt, wāstkōt′)n.
1. A garment formerly worn by men under a doublet.
2. Chiefly British A short, sleeveless, collarless garment worn especially over a shirt and often under a suit jacket; a vest.
waistcoat′ed adj.