Why do they wear orange on King's Day?

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Tags

1. #april
2. #orange
3. #revelers
4. #country
5. #county
6. #indeed
7. #pride
8. #birthdays
9. #heard
10. #above
11. #color
12. #national
13. #dutch
14. #flown
15. #boven
16. #tricolor
17. #pennant
18. #signify
19. #amsterdam
20. #oranje
21. #entire
22. #symbolize
23. #turns
24. #royal