I was just reading Angie's post on wardrobe versatility and many people mentioned that they demand that their wardrobe workhorses are particularly versatile.

I'm working on building a wardrobe with pieces that I really want to wear and have realised that I lack some key pieces (like a great pair of black pants).

I'm interested to hear from others about which pieces are the work horses in your closet- the ones you would hate to live without?