In American English, the term pantyhose generally refers to hosiery traditionally worn by women since their introduction in 1959, however some manufacturers also produce pantyhose for men, or, colloquially, mantyhose, brosiery, or guylons.
In 1996 L'eggs, a US pantyhose company, opened a storefront together with a product-related bulletin board on the web.
Thus the almost opaque tights are not suited as pants.
There are many sub-classifications of tights or pantyhose that describe the precise construction (such as control top, seamless, support and sheer).
Tights are a kind of cloth garment, most often sheathing the body from the waist to the toe tips with a tight fit, hence the name.