You don’t wear a band’s t-shirt to hang out with them, and you don’t rock Gryffindor attire when working with Daniel Radcliffe– lest you come off as an obsessed fan in a way that is decidedly uncool. Unfortunately, for Samara Weaving, a tattoo isn’t as easy to change as a t-shirt. So, to prevent the embarrassment that would come from Daniel Radcliffe seeing the leg tattoo that marked her as a die-hard Potterhead, Samara Weaving wore really long socks.
Article source: https://www.cinemablend.com/news/2479538/samara-weaving-tried-to-hide-her-harry-potter-tattoo-from-daniel-radcliffe