When choosing what to take with you to your hotel, think functionality and comfort. Casual, loose-fitting clothing is perfect spa attire. Along with bathrobes, most hotels supply slippers. However, if you're taking a yoga class, pack your favorite trainers or sports shoes. Want to hop in the steaming hot tub or enjoy a dip in the pool? A swimming suit is essential. While spending all day lounging around in practically nothing can feel very freeing, remember that a restaurant dress code may apply if you're at a high-quality resort. Bring something stylish to wear in your bag too — just in case.