There is a small group of nouns that exist only in the plural form, for example: clothes, pants, scissors, shorts, thanks, trousers.
A handful of nouns, such as garments, pants, scissors, shorts, thanks, and trousers, only have plural forms.
These nouns are frequently referred to as "plural-only nouns" since they do not have a singular form.
They are used with plural verbs and plural pronouns, as in the sentence: My pants are filthy. They need to be washed.
Nouns in the Plural with Two Parts
Many two-part tools or clothing items are plural-only nouns:
boxers, briefs, tights, and pants, PJs, shorts, jeans, pants, and trousers
Headphones scissors, tongs, tweezers, pliers sunglasses, Ray-Bans, glasses, and binoculars
We may use the terms "pair of" or "pairs of" to quantify the examples above because they consist of two pieces.
A pair, one pair, my pair, this pair, etc. are all acceptable ways to refer to a single thing. Two pairs, three pairs, etc. can be used to denote several items.
I should get some new sunglasses.
That old set of headphones may be discarded.