jackets

1. A piece of clothing worn on the upper body outside a shirt or blouse, often waist length to thigh length.
2. A piece of a person's suit, beside trousers and, sometimes, waistcoat; coat (US)
3. A protective or insulating cover for an object (e.g. a book, hot water tank, bullet.)
4. A police record.
5. In ordnance, a strengthening band surrounding and reinforcing the tube in which the charge is fired.
6. The tough outer skin of a baked potato.

   Cook the potatoes in their jackets.

verb

To enclose or encase in a jacket or other covering.