Nami: Wait, you are a shapeshifter, why not just make your body fit the clothes you have or buy?

Yuki: Well, this is my natural size, and as I told you, I'll be working with the boy, so–

Nami: You think Phil would acidentaly make your shifted form revert?

Yuki: Yep, and that would totally destroy my clothes. Want me to give you a demo?

Nami: Nope, I'm good.