What does a man with billions of dollars have in his wardrobe? If you are Facebook founder Mark Zuckerberg, the answer is identical grey T-shirts and navy blue sweaters.
On Tuesday (Jan 26), he posted a humorous post highlighting his utter lack of wardrobe choices.
"First day back after paternity leave. What should I wear?" the 31-year-old wrote.
Mr Zuckerberg had revealed in 2014 why he sticks to a "uniform" every day. During a public Q&A, he said: "I really want to clear my life to make it so that I have to make as few decisions as possible about anything except how to best serve this community."
The 31-year-old is not the only celebrity who keeps it simple sartorially. We take a look at a few others.
The late Apple co-founder was famous for wearing a black turtleneck sweater, blue jeans and sneakers from New Balance every day. In fact, his "uniform" came from an aborted attempt to get all his employees wearing one of their own.
Visiting Japan in the 1980s, Mr Jobs found out why Sony's factory employees all wore the same thing - after World War II, companies gave their employees uniforms to wear because no one had any clothes. As the decades went by, the uniforms became a way for workers to bond with the company, and Mr Jobs was keen on Apple employees forming that sort of bond, Gawker reported.
Mr Jobs asked Japanese fashion designer Issey Miyake to design a vest for Apple's employees, but Mr Jobs was booed off stage when he pitched the idea to his workers. Coming to enjoy the convenience and signature style a uniform provided, Mr Jobs asked Mr Miyake to "make me some of his black turtlenecks that I liked, and he made me like a hundred of them", he told writer Walter Isaacson. "I have enough to last for the rest of my life."
The US President has a very similar line of reasoning as Mr Zuckerberg's for sticking to blue or grey suits almost every day.
He told Vanity Fair in 2012: "You'll see I wear only grey or blue suits. I'm trying to pare down decisions. I don't want to make decisions about what I'm eating or wearing. Because I have too many other decisions to make."
Mr Obama is so associated with the suits that it made headlines around the globe when he turned up in a tan suit at a press briefing in 2014, even attracting criticism for his "casual" appearance while speaking about the seriousness of the threat of the Islamic State in Iraq and Syria (ISIS) group.
The movie director, known for Interstellar, Inception and The Dark Knight trilogy, decided that it was "a waste of energy to choose anew what to wear each day", The New York Times reported in 2014.
His outfit is not quite as unique as Mr Jobs'. Mr Nolan sticks to a dark jacket over a blue dress shirt, with black trousers over sensible shoes, with a fitted herringbone waistcoat in colder weather.
There is apparently some room for personality within a uniform, especially if you are a famed fashion designer.
Mr Lagerfeld is usually photographed with a slicked-back ponytail, sunglasses and a black suit over a white shirt, but he switches up the pair of gloves and necklace he wears to give each outfit a different touch.
His look has been immortalised in a limited edition Barbie doll which sold out in under an hour, The Independent reported.
You probably won't have heard of her, but there's a decent chance you may have read New York art director Matilda Kahl's tale of how she settled on a fashion uniform.
Her story, titled "Why I wear the exact same thing to work every day", was posted on the Harper's Bazaar website in April last year and has been shared 120,000 times.
Ms Kahl decided on her outfit of silk white shirts, black trousers and a black leather rosette around her neck after feeling "unnecessary panic" after having a tough morning choosing an outfit ahead of an important meeting.
While colleagues asked questions - some querying if she had joined a sect - Ms Kahl wrote: "Today, I not only feel great about what I wear, I don't think about what I wear."