Japanese construction boots (jika-tabi). Steel toe, thin and flexible minimalist soles (about the same as Vibram Fivefingers), and the split toe allows for toe spread (which improves balance on the job site) :
Worn Frictionless Thermals 1.5mm Split Toe for Sale | Kite Paddle Surf
V-Toe Flip Flop Tabi Toe Socks - Solids, Stripes, Patterns Style – V-Toe Socks, Inc