She told The Sun, "Often it’s so windy and breezy that hats are used to keep hair in place. Just like the dresses fly up, so does your hair. Right when you walk off the aeroplane those are the first photos that go viral, so the hat is often used right when they walk off for that reason."
Kate Middleton is also fond of hairnets, for when she has a chic up-do that she doesn’t want to budge, and royal women often use combs to keep their hats in place too. Princess Diana was especially fond of this trick.
So next time you see Kate stepping off a plane, wearing a hat, you’ll know why.
This article originally appeared on Marie Claire U.K.