Always pack a white dress shirt. The beauty of it is that it fits all occasions. You can dress it up with a suit and tie for a last minute meeting or roll up your sleeves and leave it untucked over some flat front chinos for a walk on the beach with that lovely lady you met in your hotel lobby. Try Banana Republic's classic fit non-iron shirt ($80) for a great fit that doesnâ€™t need to be ironed once you arrive. Just take it out of your luggage and go.