old-hat vs shopworn

old-hat and shopworn both are adjectives.

Word	Noun	Adjective	Verb	Adverb
old-hat	No	Yes	No	No
shopworn	No	Yes	No	No

As adjectives, old-hat and shopworn are synonyms defined as:

Other synonyms of old-hat include banal, commonplace, hackneyed, stock, threadbare, timeworn, tired, trite, well-worn.

old-hat (adjective)	shopworn (adjective)
out of fashion	repeated too often; overfamiliar through overuse
repeated too often; overfamiliar through overuse	worn or faded from being on display in a store