So what they are saying is that they would like to have the same hairstyle, meaning = no need for a haircut, or if the hair have grown longer, cut it to the exact style it was before. Though I would not mind seeing them in a different hair style. But as you know, anime character will nearly always have the same hairstyle throughout the story.

Franky's hair changes when he's out of cola though :]

I came for the Nico.

nami's hair changes every arc