https://www.telegraph.co.uk/news/1955634/Queen-dons-Muslim-headscarf-to-visit-Turkish-mosque.html
2008 Queen Elizabeth dons Muslim headscarf to visit Turkish mosque
The depths of the deplorable lack of Christianity from the Royal family can’t be fathomed, but I’ll decline to criticize her on this. It’s what many Turks consider “decent” attire, and even the Catholic Church asks visitors to the Vatican to dress “decently.” (In the case of the Catholics, it means covering thighs and midriffs, not hair.)