It's "knickers are". Since this British term only has a plural form, it's incorrect to say "knickers is".
It's "knickers are". Since this British term only has a plural form, it's incorrect to say "knickers is".
My knickers are clean.
My knickers is clean.
Follow the same practice with other verbs (have, look, fit, etc.)
My knickers have a pink bow on the front.
My knickers has a pink bow on the front.
Being a plural noun, we use a plural determiner or pronoun (they, them, these, those, etc.) with it.
Those knickers are not mine.
These are called knickers in British English.
Don't use the article "a" before plural nouns (like "knickers"). However, you can use the expression "a pair of knickers". In this situation, include a singular form of a verb because the word "pair" denotes a single entity.
There is a pair of knickers in the drawer.
There are a pair of knickers in the drawer.
This is a partial list of clothing-related nouns that only have a plural form, and therefore take "are":
