Short nightdresses, particularly those made from cotton or rayon, can indeed be worn as casual summer dresses. With their lightweight and comfortable fabrics, these nightdresses offer a relaxed and effortless style that is perfect for warm weather. Pairing them with sandals or sneakers, accessorizing with a sunhat or statement jewelry, can instantly transform them into chic summer outfits. However, it's important to note that some nightdresses may have designs or details that are more suited for bedtime, so it's advisable to choose styles that are versatile and appropriate for public settings.