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A polo shirt is a T-shaped shirt with a collar and two buttons; generally they also include a pocket. Common fabrics for these shirts include jersey cotton and pima cotton. Some variations also exist: for example, longer sleeves or thicker fabric to create a "polo sweater."
Sometimes a polo shirt's cloth is cut so that the back hangs a few centimeters lower than the front. This is called a tennis tail.
A polo shirt is a frequent choice of clothing on work days such as casual Friday.