work clothes vs work clothing

work clothes and work clothing both are nouns.

Word	Noun	Adjective	Verb	Adverb
work clothes	Yes	No	No	No
work clothing	Yes	No	No	No

As nouns, work clothes and work clothing are synonyms defined as:

Other synonyms of work clothes include work-clothes, work-clothing.

work clothes (noun)	work clothing (noun)
clothing worn for doing manual labor	clothing worn for doing manual labor