Spa hotels are all about relaxing and switching off from the real world, so take clothes that are comfy, light and easy to slip into. T-shirts and yoga pants are perfect. Slippers and fluffy bathrobes are standard spa attire, however these are usually issued by the hotel. Planning on splashing around in the pool or doing a couple of fitness classes? Throw some gym gear, trainers and your bathing suit in your suitcase as well. If your hotel has a restaurant, see if dress codes apply — you may need to bring a stylish outfit to wear for dinner.