Why orange?

Because it's the national color of The Netherlands, and de Heers are Dutch!

Facts About Orange in The Netherlands

• The family name of the Dutch Royal family is van Oranje Nassau, where Oranje is Dutch for orange. They are also referred to as The House of Orange, just as the royals in England are referred to as The House of Windsor.
• During Dutch holidays, one often sees orange banners hanging alongside the red, white, and blue Dutch flag in recognition of The House of Orange.
• The national Dutch soccer team wears orange jerseys.