Sienna Miller feels "sad" about the impact social media has had on fashion.
The 'Factory Girl' actress is a big fan of 1990s wardrobes as she thinks it was the "chicest" decade and much more "original" than style is now.
She said of the era: "Women in oversized blazers and very little make-up.
"No one looked like they were trying too hard...
"I get sad looking back and seeing these pre-social media days, where people were wild and reckless, and nothing was contrived or over thought.
"There were these original moments in fashion - even though they didn't feel it at the time."
Despite always being praised for her own sense of style, the 37-year-old actress - who has daughter Marlowe, seven, with former partner Tom Sturridge - doesn't always enjoy walking the red carpet and thinks the key to pulling off a look at a big event is to feel confident.
She told Grazia magazine: "The red carpet itself is always a blur.
"I try to check out mentally and get through it. Often, a glass of wine before helps.
"I think you have to have a sense of self. A person who's wearing something as simple as black jeans and a T-shirt can radiate glamour, and that comes with self-confidence, being calm an centred."
Living in New York has made Sienna give up high-heeled shoes.
She said: "Flats for sure. I run around everywhere and New York is a walking town."
Though the 'American Woman' actress shops "a lot less" these days, she still has her favourite haunts.
She said: "I love Portobello Market and always have.
"It's so nostalgic for me and one of the first places I like to potter around when I get home.
"I seem to shop a lot less in New York but there is a great place called Personnel in the West VIllage that is beautifully curated. I always seem to find things there that I don't see anywhere else."
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