The primary goal is being comfortable and relaxed while you're staying at a spa hotel, so loose-fitting, casual clothing is encouraged. While it's likely you'll spend much of your time in slippers and a bathrobe, these are usually waiting for guests when they arrive. If you want to make the most of the resort's fitness facilities, pack your sportswear. Hoping to kick back and unwind in the pool or hot tub? Be sure to pack your swimming suit. In addition to toiletries and other personal items, bring extra clothing too. It's always nice to have something dry and clean to put on after a relaxing massage.