[She nods her acceptance of his explanation.] They're amusing little anecdotes of silly things wizards imagine Muggles to do. [Children take them as gospel until they reach school, as children are wont to do.

Narcissa doesn't need much room, but her skirts are marvellously voluminous, so his action is appreciated if a tad unnecessary. It's only fabric.]

Something along those lines. I do take immense satisfaction in looking my best when I don't want to be somewhere; sort of like armour, I suppose.