I carry a selection of what I would need for a few days in case the luggage doesn’t arrive. So if I am bringing a tux, a suit, and a couple of jackets, a few pairs of khakis, shorts, etc, I’ll have at least one pair of nice pants, a jacket, a couple of pairs of shorts, couple of bathing suits etc. So if my luggage does get lost, I’m not sitting in a dining room in a pair of shorts and a t-shirt looking like somebody who doesn’t know how to travel.