As Merlin explains verbally, Melinoë glances at the work already completed and begun for the visual assistance, more so to copy his format than anything else.

Knowing it'll be dirty work, she picks at her dress, looking from it up to Merlin, and then back to the dress once more. "If I work in the nude, will it distract you too much?"

It's to avoid tripping on the strings and nothing borne out of vanity. But should it be an issue, Mel is already thinking up a way to keep the outfit from becoming a hindrance.