Birdseye (Bird's Eye or Birds-Eye) is an all over woven suiting made from a small geometric pattern with a dot suggesting a bird's eye

The fancy-solid suiting fabric is a favourite of bespoke tailors and their more stylish patrons. 

It is a formal worsted, occasionally enlivened by ton-sur-ton checks, more adapted to complete suits. It is not dissimilar to sharkskin, but with the difference of being lighter, which makes it a good choice for spring or autumn, but it can also be worn in winter.