These are Uniqlo girl's denim stretch pants. Size: 125-135 cm tall, waist 51-57 cm. The waist is adjustable with elastic and has a decorative button, with a hook closure on the inside, making them easy to wear. The inside is patterned with blue polka dots, but they are simple enough that they could be worn by a boy. They are stretchy and can be worn stylishly. Please purchase if you understand that these are used items.