To see the latest in clothing design

Every year, people travel to Italy to see the latest in clothing design.

Question: May I know what the word “in” mean in this sentence?
Is it a preposition? Or is it an adjective, means fashionable?
Thank you!!!

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“in” does sometimes mean fashionable.

“it’s the latest in thing”

but in your sentence it’s a preposition. It means “see the latest trends in clothing design”.