The main goal is being comfy and relaxed while you're at a spa hotel, so loose, non-restrictive clothing is what most guests generally wear. While you'll likely spend much of your time in a robe and slippers, these are usually supplied to guests when they check in. If you'd like to take advantage of the fitness facilities, pack your sportswear. Hoping to relax in the pool or sauna? Be sure to pack your swimming suit. In addition to toiletries and other personal effects, bring a change of clothes too. It's always nice to have something clean and fresh to slip into after a massage or swim.