Dressing for St. Thomas in 2026 requires a focus on lightweight, breathable fabrics like linen and cotton to handle the year-round temperatures of 75°F to 85°F. For daytime exploring in Charlotte Amalie or visiting Magens Bay, the standard "island uniform" is shorts, tank tops, and sundresses. However, you should always pack a rash guard and high-SPF, reef-safe sunscreen, as the sun is exceptionally strong and local laws strictly prohibit sunscreens containing the "3 Os" (Oxybenzone, Octinoxate, and Octocrylene). For footwear, bring comfortable walking sandals for the steep, cobblestone hills and water shoes for rocky snorkeling spots. While the islands are casual, "island chic" is expected for dinner at upscale resorts; men should pack a collared linen shirt and slacks, while women often wear maxi dresses or nice skirts. It is also important to remember that swimwear is for the beach only—it is considered culturally disrespectful (and in some areas, technically illegal) to walk through town or into a shop in just a bikini or swim trunks without a proper cover-up. A light cardigan is also a "pro" tip for heavily air-conditioned shops and ferries.