A T-shirt is a style of shirt that is named because of the shape of the garment.I remember when t shirts were called sloppy joes named after the Gi shirts around the 40s and 50s and probably came from GI Joe.Mostly or T-SHIRTS have short sleeve and a crew neck and made of cotton or a cotton polycotton mix. A shirt is usually not that expensive apart from special designer ones. The cotton textile are very comfortable and soft next to the skin so the garment is while doing physical exercise or for summer wear.