Plural of trousers

What Is the Plural of Trousers?

The Quick Answer

The word "trousers" has no plural form.

"Trousers" has no plural form. We put "pair of" or "pairs of" in front of the word "trousers" to give it its singular and plural form.

For example:

One pair of trousers
Two pairs of trousers

Never wear your best pair of trousers when you go out to fight for freedom. (Henrik Ibsen )
I can't decide whether to pack two or four pairs of trousers, so I usually take them all. (June Whitfield)

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The Standard Rules for Forming the Plurals

The table below shows the standard rules for forming the plurals of nouns in English.

Type	Example of Type	Forming the Plural	Plural
Most Nouns	cat scythe	add s	cats scythes
Noun Ending s, sh, ch, x or z	bus dress	add es	buses dresses
Nouns ending [consonant] o	mango zero tomato	add either s or es (There are no rules for this - you have to know.)	mangoes or mangos zeros tomatoes
Nouns ending [vowel] o	patio ratio	add s	patios ratios
Nouns ending [consonant] y	story penny	change the y to an i and add es	stories pennies
Nouns ending [vowel] y	storey () donkey	add s	storeys donkeys
Nouns ending f or fe	dwarf knife	ves and/or s (There are no rules - you have to know.)	dwarfs knives
Exceptions	goose louse	some nouns undergo a vowel or letters change	geese lice
More exceptions	salmon trousers	some nouns do not change at all	salmon trousers

Why Is There Confusion over the Plural of Trousers?

Confusion arises because "trousers" has no plural form. Unfortunately, there is no clever way of knowing which nouns follow which rules. You have to know.