Luna smiled and nodded, taking the dress and headed to the indicated bedroom with a gait that could only be described as halfway between floating and bouncing. Once there, she changed quickly into the dress, frowning only briefly at areas that didn't fit her as well as she'd like. However, charming a dress that didn't belong to her seemed a bit uncouth.
Heading out of the bedroom, she tilted her head, relaying none of her concern even as she announced, "I like it, though I think some alteration may be required."
She turned slowly, allowing Hermione to see the dress, more because she felt the motion was expected than that she truly worried Hermione's vote would change anything.