A blue shirt can come in various shades ranging from light sky blue to deep navy. It's usually made from cotton or a cotton-blend fabric, offering comfort and breathability. The style can vary, from casual button-downs with collars to more formal dress shirts with structured cuffs and a neat finish. Some blue shirts might have patterns like stripes or checks, but a solid blue shirt is a timeless choice that pairs well with jeans, chinos, or even under a blazer for a smart-casual look.