The London-based French actress Clémence Poésy, who stars in tonight’s new TV drama The Tunnel (Sky Atlantic, 9pm), knows how to use a hat to her advantage. When you’re wearing a simple outfit like Clémence – and when we say simple we’re obvs referring to the French meaning of the word, i.e. perfection (that just-so jumper, cashmere scarf and buckled brogues didn’t happen by accident) – a hat will subtly up your game. Follow Clém's cue and top off your look with a wide-brimmed floppy or fedora hat.