This is a long-sleeved T-shirt from Cath Kidston. It didn't get much wear before my child outgrew it. It's been worn about 1 or 2 times. It's labeled as 9-12 months, but I think it's about a size 90. The arms are slim. Please refer to the actual measurements. Width: Approximately 26 cm Length: Approximately 30 cm - Brand: Cath Kidston - Size: 9-12 months Thank you for looking.