Purple reign.

Jacqueline Kennedy Onassis’ most famous “election night look” is about to go under the hammer — and no, it’s not a ballgown.

It’s the violet-colored maternity coat she wore while eight months pregnant, as her husband was announced as the next American president on Nov. 8, 1960.

As first reported by WWD, Sotheby’s is rolling out the purple carpet at its new, high-profile Madison Avenue HQ , where the former first lady’s statement-maker will headline the auction house’s first-ever Handbags & Fashion showcase.

Bidding for the historic piece — a pop of color that stood out like a beacon in the sea of drab campaign-season suits — opens ahead of the Dec. 15 sale, with estimates between $6,000 and $8,000, the outlet reported.

The coat isn’t just chic — it’s legendary. It gr

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