Royals aren't always in a skirt or dress. Sometimes they want a dress-down day, too, say if they're visiting a farm or taking the children to school. So what's their go-to piece for a casual day, you ask? That would be jeans. Whether flare or skinny, white or dark blue, royals can't get enough of this basic piece - and they shouldn't. As Kate Middleton's proven, even royals can style jeans for all types of occasions. Though she has a strong denim collection, Kate isn't the only one to give them that princess touch. Ahead are several other royal ladies who have worn the everyday bottoms and looked just as polished.