old-hat vs well-worn

old-hat and well-worn both are adjectives.

Word	Noun	Adjective	Verb	Adverb
old-hat	No	Yes	No	No
well-worn	No	Yes	No	No

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

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

old-hat (adjective)	well-worn (adjective)
out of fashion	repeated too often; overfamiliar through overuse
repeated too often; overfamiliar through overuse	showing signs of much wear or use