"It's Brunello Cucinelli. I know this because I worked in the store he shopped in. They are $400 t-shirts and those sweatshirts are Brunello as well and are around $3,000."
"Mark Zuckerberg wears custom made Brunello Cucinelli tees in marl grey. I believe they run long for him, thus needing a hem. He chooses to order in bulk for an estimated cost per unit that varies from $300-$400. Price reflects on an order of plain custom tees vs. one of grey tees that feature the original 3 emblem Facebook insignia on the upper left chest."