Hermione blushed. She really wanted to believe that what Narcissa offered as an explanation was true. She wasn't sure that it was but it was a nice thing to say! She shrugged but didn't comment. However, she did give Narcissa a bright, slightly flirty, smile.
Narcissa's compliment caught Hermione completely off guard. Now it was her turn to be dumbstruck. She didn't want to make a big deal out of it so she turned to look in the mirror though her blush was a plain as day.
"Thank you." She turned to Madame Malkin. "I think I will take this one."