It's a deep blue-gray color. The material is listed, but it's made of soft cotton that's easy to wear, and my child loved it. It's not lined, but it's not see-through. It can be worn year-round except in the peak of summer. My child wore it when they were between sizes 90-110, so it can be worn for a long time. There used to be three buttons on the back, but the top one is missing. However, my child still wore it without issue. This is a gray three-quarter sleeve dress with a black frilled collar. - Color: Blue-gray - Collar design: Black frilled collar - Sleeve length: Three-quarter sleeves - Material: Soft fabric - Style: A-line design Thank you for looking.