I'm just going with clothing and shoes here, but post whatever you want.
1. Black leather shoes, I prefer a brogue.
2. Khaki trousers, flat front.
3. White dress shirt.
4. Blue dress shirt.
5. Dark gray/charcoal suit.
6. Light gray suit.
7. Navy blazer.
8. Black leather full grain belt.
9. Classic red tie.
10. Dark wash pair of jeans.
That's the top ten I can think of right now. I am leaving out a ton of things I just couldn't live without, but this is my 10 bare minimum items. What is in your "10 items every man should have in his closet" list?