"Unless in the fuss of getting into that outfit you lost track of time." Her grin only widens. "It certainly looks like you took a while to get dressed tonight."

Not that he looks bad by any stretch of the imagination. Nervous, yes. Very handsome and befitting his costume? ...also yes.

"It suits you, though. The costume, I mean. You look nice." Her smirk warms into an actual smile, a little flustered as it is. Compliments aren't really her forte, but at least she actually means this one?