Let me just say this, when I say Mila's swimsuit with a hoodie is "fitting" I mean that it's fitting of her character.
Mila looks like she would wear a hoodie to the beach rather than have everything on show like her other swimsuit borrows, and we haven't seen the bottom half yet she may actually be wearing jeans and/or her trademark shoes.
So I didn't mean adding a hoodie to a swimsuit = Mila lol.
As for the Zack Island thing, Maybe but, I think it could also be the Fabled rainy Sakura stage we were promised way back in vanilla