"See, that’s what I mean. It’s hard to deny that, isn’t it? Here, let me," Harry sat obediently while she fiddled with his collar, her brow furrowed in concentration as she experimented with tightening and loosening his tie, shifting his shirt to one side or the other, and undoing and doing up buttons, until she was satisfied with how the fabric lay against his skin, "There," she said, before pointing her wand at him and tapping his collar - he felt it flash cold against his skin for a second, "That should help it stay in place."