For a cruise to Australia and New Zealand in 2026, the key is versatility and layering. During the peak summer months (December–February), pack breathable cotton or linen fabrics for port days in Sydney or Auckland, where temperatures can hit 30°C. However, the Tasman Sea and New Zealand’s fjords can be notoriously breezy and damp even in summer, so a high-value strategy is to include a light waterproof windbreaker and a fleece or pashmina for evening deck walks. For "Smart Casual" nights, most lines recommend chinos and collared shirts for men, and sundresses or nice trousers for women. Don't forget high-SPF sunscreen and a wide-brimmed hat, as the Southern Hemisphere sun is exceptionally strong. If your itinerary includes the South Island or Milford Sound, sturdy walking shoes are a peer-to-peer essential for navigating damp trails or rocky shorelines comfortably.