jacket

ot noun

1. The tough outer skin of a baked potato. Cook the potatoes in their jackets.
2. A piece of clothing worn on the upper body outside a shirt or blouse, often waist length to thigh length.
3. A piece of a person's suit, beside trousers and, sometimes, waistcoat; coat (US)
4. A protective or insulating cover for an object (e.g. a book, hot water tank, bullet.)

fe’l verb

1. To enclose or encase in a jacket or other covering.