You are a pirate with the hypno hypno fruit powers, you had recently battled the Straw Hats on an island and during the chaos between your crew and Luffy's, you managed to use your powers on Nami and Robin.

You would capture the navigator and archeologist and hypnotize them into believing they were a part of your old timey pirate themed crew

Nami now wore a red bandana tied underneath her long orange hair, a brown coat, black pirate shorts, and now black heeled sandals. Robin kept her long black hair down, but now wore an old timey white strapless frizzy shirt with a brown laced chest and waist garment over it, a black sash, a long purple skirt down to her ankles, and a pair of brown pirate boots

Nami: Yar! I be the navigator of this here pirate crew, Greedy Eye Nami! She declares, speaking in old pirate talk

Robin: Aye! And I be the archeologist of this here crew, Multi Limb Robin! She adds, referring to her devil fruit powers

Nami holds her staff while Robin holds an old pirate sword

Nami: Yar, we be loyal crew members for ye, Captain! She smiles with pride with a salute

Robin: Aye, Greedy Eye Nami be right in that statement! We here are loyal crew members to yer pirate crew, the Hypno Pirates! She says, pointing her sword into the air with vigor

Nami: Now where we be sailing next,. Captain? I be the best navigator in all the grand blue!

Robin: Aye! Greedy Eye Nami be right on that there regard! And he also have me archeology background to help ye and yer crew!