"It was the idea that anyone literally could go out now and buy Lily's outfit," says costume designer Julian Day, about Lily James's late-'30s pantsuit and cottage-core aesthetic.

Plus, Amazon's Prime Day sales soar despite technical glitches.

The red (er, blue) carpet was like a giant party, and all your faves dressed for the occasion.

Kate Middleton, Michelle Obama, Lily James and more stuck to black and white.

Because it's actually summer now. Get it?

The cast includes Sienna Miller, Lily James, and Domhnall Gleeson.

Plus, Lily James strips down for her Burberry fragrance campaign.

It'll be the "It" Brit's very first global advertising campaign.

From Amal Clooney to Lily James, a dramatic femininity pervaded the red carpets.

And Suki Waterhouse was the de facto Prom Queen.

We're looking at you Kruger.

If you wore Gucci on the red carpet this year, chances are you're on this list.

The actress accepted her Breakthrough accolade at the 2015 'Harper’s Bazaar' Women of the Year Awards.

Only the best for fashion darlings Sienna Miller and Alicia Vikander.

Plus the rest of the week's best dressed (outside of Paris).

As celebs like Lily James and Emily Ratajkowski demonstrate, it's all about dark hues and autumnal fabrics.

It's evident when someone is comfortable in her own skin.

Welcome to the British beauty's post-'Cinderella' fashion era.

Zayn Malik and Joe Jonas made our best dressed list this week.

How did I not think of this?

In Elie Saab Couture.

Like us, they're still a little skeptical.

As her stylist Rebecca Corbin-Murray says, "When else are you going to get to wear a glass slipper like that?"

Just as a (Disney) princess should.