This is a light blue, short-sleeved children's polo shirt. 

It is commonly worn as a school uniform or class uniform for primary and secondary school students, and is also suitable for daily casual wear. 

- Style Features: It features a classic collar and a single-button placket, which is simple yet elegant. 

- Fabric & Design: It is often made from breathable materials like pure cotton or mesh fabric, ensuring comfort. The loose fit allows for easy movement. 

- Styling & Use: It can be worn alone or as a base layer. Its simple design makes it a common choice for school uniforms.