Costume vs Uniform

When to use each in English, with meaning, register, and examples.

Costume

Top 2,000 (common) B1 noun

Uniform

Top 2,000 (common) A2 noun

	Costume	Uniform
Pronunciation	🇬🇧 /["/ˈkɒstjuːm/"]/ 🇺🇸 /["/ˈkɑːstuːm/"]/	🇬🇧 /["/ˈjuːnɪfɔːm/"]/ 🇺🇸 /["/ˈjuːnɪfɔːrm/"]/
Meaning	An outfit worn for a particular occasion, often for parties or performances.	The same clothes worn by a group of people.
Example	She wore a vibrant costume for the Halloween party.	Every student at the school is required to wear a uniform.
Register	Neutral	Neutral
How common	Top 2,000 (common)	Top 2,000 (common)
CEFR level	B1	A2
Part of speech	noun	noun
Collocations	full, colourful/​colorful, elaborate, be dressed in, dress in, have on, design, designer, drama, in costume, full, colourful/​colorful, elaborate, be dressed in, dress in, have on, design, designer, drama, in costume	full, smart, regulation, don, be dressed in, in (a/​the) uniform, out of uniform, full, smart, regulation, don, be dressed in, in (a/​the) uniform, out of uniform
Antonyms	nudity, plainness	casual wear, civilian clothes
Common mistakes	Confused with 'custom', meaning a practice or habit., Using 'costume' for regular clothes instead of special outfits.	Confused with 'unify'; they have different meanings., Used in the plural form ('uniforms') when referring to the concept more generally.
Usage notes	Use 'costume' when referring to clothing for events like Halloween or theatrical performances. Avoid using it in formal contexts not related to dress or play.	Used when referring to clothes that identify a specific group, like students or police. Not used for casual clothing in informal contexts.

See it in real clips

And our uniforms.

Peaky Blinders › S1 E1

they will be sworn in and in uniform.

That uniform is a trip, Forrest.

And our uniforms.

Peaky Blinders › S1 E1

they will be sworn in and in uniform.

Uniform

Frequently asked questions: Costume vs Uniform

What's the difference between Costume and Uniform?

Costume: An outfit worn for a particular occasion, often for parties or performances. Uniform: The same clothes worn by a group of people.

Which is more advanced: Costume and Uniform?

Costume is the highest level, at B1, on the CEFR scale.

Are Costume and Uniform the same CEFR level?

Costume: B1, Uniform: A2 on the CEFR scale.

What part of speech are Costume and Uniform?

Costume: noun, Uniform: noun.

Can you show an example of each?

Costume: She wore a vibrant costume for the Halloween party. Uniform: Every student at the school is required to wear a uniform.

Can I use Costume and Uniform interchangeably?

Not always. Costume and Uniform are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.