It's "a pair of knickers". "Knickers" is primarily a British term that only has a plural form.
It's "a pair of knickers". "Knickers" is primarily a British term that only has a plural form.
Yesterday she bought a pair of knickers.
Yesterday she bought a knickers.
Plural nouns, like "knickers", cannot be preceded by the article "a" because "a" is for one. But you can use the determiners "a pair of", "two pairs of", "three pairs of", etc. to count these items.
I have to buy a pair of black cotton knickers.
There were only three pairs of knickers in the drawer.
You can also use other determiners for plural nouns (the, some, both, any, these, etc.) or a possessive pronoun (my, your, her, etc.).
I love these knickers.
My knickers are wet.
But omit the determiner to talk about knickers in a general way.
Uncomfortable knickers can put you in a bad mood.
And remember, plural nouns take a plural form of a verb, so we say "my knickers are"—not "my knickers is".
My knickers are too loose.
My knickers is too loose.
Follow the same convention with these plural nouns: