The primary goal is being relaxed and comfortable while you're at a spa hotel, so loose, casual clothing is what most guests generally wear. While you'll likely spend a lot of time in little more than a fluffy robe, these are often supplied to guests when they arrive. If you want to make the most of the exercise facilities, pack your sportswear. Hoping to ease some tension in the pool or steam room? Make sure you throw a swimsuit in your bag. Along with toiletries and other personal effects, bring some spare clothes too. It's good to have a clean, dry outfit to put on after a massage or body treatment.