Is Oxford or Derby more formal?

Related questions

1. Are oxford shoes dress shoes?
2. What is an Oxford style shoe?
3. What color shirts go with brown shoes?
4. Can I wear blue shoes with blue jeans?
5. How often should I change my shoes?
6. Should I wear the same shoes everyday?
7. Can you wear an oxford shirt with jeans?
8. Should you tuck in shirt with jeans?
9. What shoes are formal wear?
10. Why do they call shoes pumps?

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20. #answer