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A Pair Of Trousers. Folded Pair of Jeans stock image. Image of trousers, pair 8916099 (In some early instances the word appears to mean stockings.Since stockings are a logically plural form, it would make sense that derivative terms would be plural as well. In the above examples, the nouns jeans and pliers take the plural verb are, and the noun pair takes the singular verb is.

However, that does not mean that they cannot be separated and spoken of individually (unlike non-separable 'pairs' like trousers and spectacles). OED suggests that "trousers" may have derived from "drawers."

Why Do We Say “A Pair of Pants”? Britannica

We put "pair of" or "pairs of" in front of the word "trousers" to give it its singular and plural form Note: A pair of is always followed by a plural noun We put "pair of" or "pairs of" in front of the word "trousers" to give it its singular and plural form

My first pair of (Ultimate) Trousers This Blog Is Not For You. A garment for the lower part of the body and legs: now usually restricted to under-hose worn next the skin To refer to a single item from these plural nouns, you use "a pair of." For example, "a pair of trousers" or "a pair of scissors."

The modern voice of classic elegance Brown pants men, Trousers, Corduroy. The verb "put" causes no alteration to the construction of "trousers" as a plural, as given in the examples in the old thread Plural nouns, like "trousers", cannot be used with numbers or the article "a"