[Vivi's brow furrows somewhat as Sanji sputters. She looks from him to the dress and back again, then nods.] Yeah, if it doesn't fit, I guess we have to.

But...I bet it will! Because you have a skinnier butt than Nami, and you don't have... [And she cups her hands a good distance from her chest to illustrate big boobs. Hmm, come to think of it, they should probably find something to stuff the front with. Maybe some socks. Oh, and they're need some makeup, too! Sanji may notice the gears are turning.]