A trip to a spa hotel is about relaxing and switching off from the real world, so bring clothes that are comfy, light and easy to wear. Tracksuit pants and sweatshirts are good options. Bathrobes and slippers are customary spa attire, however these are usually issued by the hotel. Planning on going for a dip in the pool or limbering up with a yoga class or two? Throw some gym wear, sports shoes and a swimming suit into your suitcase too. If your hotel has an on-site restaurant, see if dress codes apply — you may need to bring a chic outfit to wear to dinner.