This is a 3-piece formal style set. The cardigan-style top is a single layer. It can only be opened and closed with the top button, so it's the type you put on over your head. Both pairs of trousers have adjustable waists. The white trousers have lining at the ankles, so they look stylish when folded up. There is a slight stain on the knees. The top and white trousers are from Comme Ca ISM, and the gray shorts are no-brand. The shorts are made of thick fabric suitable for winter. The top is size 100, the white trousers are size 90, and the gray trousers are size 95. I think this can be used for weddings, memorial services, parties, graduation ceremonies, and entrance ceremonies. It has only been worn a few times. Please note that there may be some fold wrinkles due to home storage.