For business, a small rotation of classic colours covers almost every working day.
Navy is the first suit every professional wardrobe needs. It is authoritative without being severe, and it pairs with white, light blue and pale pink shirts alike.
Charcoal is the second essential. Slightly more formal than navy, it is the right choice for important meetings and presentations, and it works beautifully with a white shirt and a dark tie.
Dark grey and mid-grey add variety for the rest of the week, while black is best kept for the most formal business occasions and evening events.
Whatever the colour, keep the rest simple: a crisp shirt, a restrained tie, a dark belt and polished shoes. In business, the suit should support the message — not distract from it.