Mr. Musk is fundamentally a creature of Silicon Valley, a scene that initiated an entire revolution in power dressing. The young masters of that universe dressed down to show that they were members of a new elite — one that refused to dress like the grown-ups they were about to topple. It was the defeat of the suit by the T-shirt.

In the photos, Donald Trump, dressed in a dark blue suit, red tie and a long overcoat, is seen walking alongside little X, who is wearing a dark coat and beige pants. The child appears to be in high spirits, happily skipping with a toy in one hand.

Billionaire Elon Musk — head of SpaceX, Tesla and X.com (formerly Twitter) and the richest man in the world — was a major contributor to Donald Trump's 2024 campaign. And after Trump narrowly won the election,