These are attachable sleeves purchased from Catherine Cottage. The color is lilac. It's a mature and elegant color (^^) They cost 2720 yen including shipping when I bought them. I bought them for my child's piano recital but didn't use them, so they are unused and brand new. I haven't even washed them. The recital only happens once every two years, and I don't think I'll use them next time, so I'd be happy if I could pass them on in their beautiful condition♬ Here's the official description☺︎ Add attachable sleeves for a rich look! A special dress style that exudes an elegant aura We propose a new way to wear kids' dress styles for piano recitals, weddings, and parties. Add attachable sleeves to a sleeveless children's dress and update your dress coordination to your liking! The fluffy attachable sleeves made of lace or tulle cover the upper arms while adding an elegant nuance.