Grey sits alongside navy and charcoal in the triumvirate of suit colours that form the foundation of a proper professional wardrobe and what grey offers that the others don’t is a certain softness and approachability that darker colours don’t quite have. A mid grey suit reads as authoritative without being intimidating which makes it very useful for situations where you want to project competence without stiffness. It also works beautifully with a wider range of accessories than most other suit colours. Pink shirts look excellent with grey in a way they don’t quite work with navy. Brown accessories that feel slightly off with charcoal work brilliantly with lighter greys. The range of tie colours that work is broader too. If you’re building a two suit wardrobe and already have a navy or charcoal a grey is almost certainly the right second choice for the versatility it adds to everything you can do with both.