Tights are a tight fitting clothing. In American English, the term includes pantyhose. They usually fit from the waist down and are often worn in dancing. Tights in the past were made of elasticized silk or other material. Modern tights are often made of spandex.
Tights were invented in 1598, by a man called William Lee. He was a reverend and made a machine that knitted together silk.
Tights come in thin and thick options. Thinner tights are called sheer and thicker ones are called opaque. People measure this thickness uses something called "denier". They are five categories that show what denier a pair of tights is: Ultra sheer, sheer, semi-opaque, opaque and thick-opaque.