Jas (Dutch: jacket) is an official European clothing suit, long-sleeved and worn outside the shirt. A suit (English: suit) or simply called a suit consists of at least a suit and a pair of pants made from the same fabric.

Based on the number of buttons on the front, the suit consists of a single breasted coat and double-breasted button coat. In English, the term jacket also refers to the suit suits (suits suit) or evening suit (evening suit) , and not the definition of a jacket in Indonesian (sports jacket or leather jacket).