These pants were never used and my child outgrew them. They have been stored at home and are in beautiful condition. I took them out of the bag for this listing. They have buttons to adjust the waist size, so I think they can be used for a long time. Because they are black, they seem suitable for formal occasions. - Brand: UNIQLO - Color: Black - Size: 130 - Style: Ultra Stretch Slim Fit Pants (with zipper) Thank you for looking.