The phrase refers to a specific type of garment often characterized by a color reminiscent of a clear, sunny sky. This article of clothing typically covers the upper body and can be fabricated from a variety of materials, ranging from lightweight cotton to more structured synthetics. As an example, consider a lightweight, breathable shirt suited for warm weather, dyed in a shade mirroring the cerulean expanse above.
The prevalence of this particular apparel item stems from its versatility and aesthetic appeal. The color often associated with it projects a sense of calm and optimism, making it a popular choice for both casual and semi-formal occasions. Historically, the dye processes required to achieve this shade were initially complex and costly, leading to its association with higher social classes. However, advancements in textile manufacturing have made it widely accessible and affordable.