First, arrange your suit carefully in the open bag before you begin folding it closed. Ensure the jacket is packed as flat as possible, and is buttoned up. Then smooth out any obvious creases, particularly around the shoulders. In the event that your formal wear emerges slightly creased at the end of the journey, try hanging the jacket and trousers vertically on a conventional clothes rail for half-an-hour. Many frequent travellers also suggest ‘steaming’ a creased suit close to a very hot shower.