billie eilish dress Wears Oscar de la Renta at the Met Gala Met Gala 2023: Billie Eilish

Photos by Ryan Kell

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I worked with [Barrymore] many times, even the TV show Santa Clarita Diet. I love working with actresses, when they're really starting in the business, and giving them confidence

To that end, you should avoid T-shirts, shorts, sandals, and even dresses that might look more like swimsuit coverups

With thanks particularly to Manchester Art Gallery, Bath Fashion Museum and the British Museum for loaned objects

What exactly is business casual, nowadays