Common Mistakes : Clothes

noun

.BAD: The dancers were dressed in their national clothes
.GOOD: The dancers were dressed in their national costume

costume = (1) (countable) a set of clothes worn during a performance by an actor, clown, etc
.She used to work for a theatre company, designing and making costumes

costume = (2) (uncountable) a set of clothes that are typical of a particular country or historical period
.The castle guides were dressed up in Elizabethan costume
.A group of Hungarian folk dancers came on stage, all wearing national costume

.BAD: Don’t go out and buy a special clothes
.GOOD: Don’t go out and buy any special clothes

: Clothes is a plural noun
(‘I need some new clothes.’ (NOT ‘a new clothes