Worth it.

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Every time we declare Elle Fanning's latest outfit the best one she's ever worn, the star somehow manages to top it. She's been on a serious fashion roll as of late, breaking out standout look after standout look, and there's no better example of this than the dreamy ensemble she wore to the screening of Once Upon A Time In Hollywood while at theCannes Film Festival.It was as if Fanning had straight-up time traveled from the 1950s, walking the red carpet in a white organza shirt, dark blue tulle skirt, and a wide-brim hat, all from Dior Haute Couture.

It's good to know that all the effort that happened behind-the-scenes was worth it, as, according to Dior, 450 hours of work went into creating what Fanning wore. 200 hours were spent on the skirt alone — which required 50 meters (164 feet) of tulle — and 150 were spent on the shirt. Take a peek at the process, as well as the throwback look in full, ahead.

Elle Fanning Cannes Dior Look
Credit: Gisela Schober/Getty Images

Elle looked super glamorous in this classic Dior ensemble.

Elle Fanning Cannes Dior Look
Credit: Courtesy Dior/Daniele Venturelli

She topped off her organza shirt and tulle skirt with a black macramé canage effect hat.

Elle Fanning Cannes Dior Look
Credit: Courtesy Dior

It all started with a sketch.

Elle Fanning Cannes Dior Look
Credit: Courtesy Dior

All that effort was definitely worth it.

Elle Fanning Cannes Dior Look
Credit: Courtesy Dior

You'll definitely want to zoom in on this stunning creation.

Elle Fanning Cannes Dior Look
Credit: Courtesy Dior

This Cannes look will surely go down in history.

Elle Fanning Cannes Dior Look
Credit: Courtesy Dior

The skirt included 164 feet of tulle.

Elle Fanning Cannes Dior Look
Credit: Courtesy Dior

Fanning's top was slightly sheer, thanks to the silk organza material.