Spa hotels are about relaxing and unplugging from the real world, so take clothing that is light, comfortable and easy to wear. T-shirts and yoga pants are a great choice. Slippers and fluffy bathrobes are classic spa attire, however these are usually supplied by the hotel. Plan on splashing around in the swimming pool or doing a yoga class? Squeeze some gym gear, sports shoes and your bathing suit in your bag as well. If your hotel has a restaurant, see if dress codes apply — you may need to take a stylish outfit to wear for dinner.