This has been advertised as being suitable for a child between 18-24 months. I purchased this for my 15 month old daughter for Christmas and it is too small around the chest. She isn't a big girl; she has only just got into 12-18 month clothes. As there is no fastening at all you have to pull it on and off over the head and it was very difficult to take off. Be warned, the retailer will not exchange it if you don't have the tag attached and the original bag and hanger. As this was a present I don't have these and I am now stuck with a costume she can not use!