na-adjective, noun
retro; nostalgic; old-fashioned
Describes something that evokes a past era, often with a positive or stylish connotation. Used for fashion, design, music, and atmosphere.
このカフェはレトロな雰囲気がいいね。
This café has a nice retro atmosphere, doesn't it?
彼女はレトロなワンピースを着ている。
She is wearing a retro-style dress.