I received these about 10 years ago, but the knit hat quickly became too small, so it wasn't worn much. The neck warmers were used for one season each when my two children were infants. I think they would probably fit if the clothing size is around 80cm. The width when laid flat is... Baby knit hat: 17cm Baby neck warmer: 18cm They should stretch further than that. There's a hook-like part on the back of the neck warmer to fasten a button (see photo 3). The hat tag has a name written on it, and the color has faded; I've erased it with a pen. These are used items worn by children, and they have been inspected and stored by an amateur. Please understand. I have a guinea pig, but it's kept in a separate room. I'm also selling on other sites, so please comment before purchasing. Feel free to ask any questions! #BabyKnitHat #BabyNeckWarmer #MUJIBaby #BabyWinterClothes - Color: Navy - Design: Dot pattern - Accessories: Neck warmer - Condition: Slightly frayed Thank you for looking.