The staplest (ha!) of staples in my wardrobe would be my black denim. It's the item I wear the most... casually and more dressed up, it's my version of the LBD. Though sometimes - on very dark days ;-) - it feels like there's too much black, so I need to break it up. Grey denim is then the perfect alternative: it's still muted, but gives the look a bit of a 'pop' anyway.