Thank you for looking (*^^*) This is a Polo Ralph Lauren vest. The size is 4. It is mainly for 3-4 year olds, equivalent to Japanese sizes 100cm-110cm. When laid flat, the length is about 41cm and the width is about 31cm. This is a used item, so please only purchase if you understand this. No cancellations or returns. Immediate purchase is welcome. We will ship on the same day. Thank you for your consideration.