This is a striped long-sleeved T-shirt from MUJI (Mujirushi Ryohin) (^^) The size is 120, but it's a slim fit, so a boy of average build wore it when he was about 90-100 cm tall. The light colors made it easy to match with various bottoms ♫ Long-sleeved cut-and-sew with a white and yellow stripe design, 100% cotton for comfortable wear. - Brand: IZO - Size: 120 - Color: White/Yellow Stripe - Material: 100% Cotton - Washing Instructions: Hand wash Thank you for looking.