
Someone buy this man some clothes —
Facebook CEO Mark Zuckerberg turns 29 on Tuesday. What do you buy a billionaire for his birthday? May we suggest some new clothes? As this gallery demonstrates, the young tech titan is famously known for his limited (some might say monotonous) wardrobe.

Mark Zuckerberg, fashion icon —
As a baby, little Mark had to wear whatever his parents dressed him in -- thus this powder blue outfit. He's been striking a blow for personal fashion freedom ever since.

Mark Zuckerberg, fashion icon —
Zuckerberg is best-known for his iconic hoodie, which even has its own mock Twitter accounts. But that may not be the most favored item in his closet.

Mark Zuckerberg, fashion icon —
Zuckerberg has become partial to this gray Facebook T-shirt, adorned with three small icons that grace every user's Facebook page.

Mark Zuckerberg, fashion icon —
Mark has worn the shirt for numerous Facebook events and announcements, like this one.

Mark Zuckerberg, fashion icon —
And this one.

Mark Zuckerberg, fashion icon —
And this one.

Mark Zuckerberg, fashion icon —
And this one.

Mark Zuckerberg, fashion icon —
He wore it in this promotional video ahead of the company's IPO in May 2012.

Mark Zuckerberg, fashion icon —
He wore it here.

Mark Zuckerberg, fashion icon —
And here. Let's hope he owns more than one.

Mark Zuckerberg, fashion icon —
Even Zuckerberg looks a little bored with his T-shirt in this photo.

Mark Zuckerberg, fashion icon —
Zuckerberg did clean up his act when President Barack Obama visited Facebook headquarters in April 2011. His suit and tie were so rare, Obama even made a joke about it.

Mark Zuckerberg, fashion icon —
But when Facebook went public on May 18, 2012, Zuckerberg was back to his hoodie-wearing ways.

Mark Zuckerberg, fashion icon —
No doubt to her great relief, Zuckerberg dressed up for his wedding to longtime girlfriend Priscilla Chan on May 19, 2012. No word on whether he rented the suit.

Mark Zuckerberg, fashion icon —
Zuckerberg faces many questions as he ponders his fashion future. Can a tech CEO still wear T-shirts and hoodies to business events at 40? 50? Probably. But let's hope Priscilla took him shopping for his birthday.