Your gray T-shirt is going to help you bring the stuffy parts of your wardrobe into more casual settings. Use it to dress down a gorgeous suit or even just a pair of nice trousers that you ...

Zuckerberg doesn't just wear any old plain grey Hanes t-shirt, though. His are special ordered from Brunello Cucinelli, and reportedly cost between $300 and $400.

Rebel Wilson keeps it casual in plain grey T-shirt and figure-hugging trousers as she emerges from her hotel with messy hair and flustered smile. By AMY ROBERTS FOR DAILY MAIL AUSTRALIA .