street clothes vs clothing

street clothes and clothing both are nouns.

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

As nouns, clothing is a hypernym of street clothes; that is, clothing is a word with a broader meaning than street clothes:

street clothes: ordinary clothing suitable for public appearances (as opposed to costumes or sports apparel or work clothes etc.)
clothing: a covering designed to be worn on a person's body

Other hypernyms of street clothes include article of clothing, habiliment, vesture, wear, wearable.

street clothes (noun)	clothing (noun)
ordinary clothing suitable for public appearances (as opposed to costumes or sports apparel or work clothes etc.)	a covering designed to be worn on a person's body