After Robin was hit by Ain’s devil fruit power, Robin was reverted to 12 years in age to 18 years old instead of her actual age which is 30. In order to try and reverse the effect, the Straw Hats made a plan to infiltrate the Neo Navy by having Robin act like an innocent young woman who wants a job.

Robin saw the plan as a logical one and agreed to the plan. To look the part, Robin borrowed Nami’s blue long sleeve sweatshirt (which was more fitting due to her regressed age), a pair of Nami’s brown shorts, and a pair of Nami's sandals. Robin would also tie her black her into a ponytail.

Robin would sneak onto the ship and sneak into your office, you being the captain, to try and talk with you. Once in, Robin would still act like her usual calm and collected self, but played up the innocent act as much as she could.

Robin: Pardon my intrusion and sneaking aboard your ship. I am by myself and have nowhere to go. She explains, her hands in her lap as she sat down across from you at your desk

Robin: I was wondering if you'd be so kind as to offer me a position on your navy ship in compensation for me being allowed to stay.