retro
adjective

- relating to, reviving, or being the styles and especially the fashions of the past : fashionably nostalgic or old-fashioned

Merriam Webster

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- looking at or copying the past
- going backwards

Cambridge Advanced Learner’s Dictionary

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WORD ORIGIN

Retro as a stand-alone adjective has been around since the 1970s. It’s a shortened form of retrograde, which was borrowed from the Latin retrogradus (going backward). According to the Online Etymology Dictionary, retro was first used to describe a revival of clothes fashions inspired by Eva Peron in the late 1960s.

Retro is used as a prefix in words like retroactive, retrospect, retrofit and retrorocket (a rocket engine that provides thrust in the opposite direction, thus causing it to slow down).

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SYNONYMS

reborn, reawakened, recovered, regenerated, rejuvenated, renaissance, renewed, restored, resurgence, resurrected, resuscitated, revitalized, revivified

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ANTONYMS

latest, newest, up-to-date

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Smuggle OWAD in to a conversation
say something like:

"Let's celebrate Dad's birthday virtually and dress all up in 1950s RETRO style."