Why did Luffy give Nami a straw hat?

Luffy's straw hat has the meaning of a pirate inheritance, and the only person he took the initiative to put on it for others is Nami.

Because Nami knew the meaning and importance of the straw hat to Luffy before joining the group, and Luffy handed the straw hat to Nami when he was fighting Aaron, which was quite a promise to Nami, so the straw hat also has a special meaning for Nami. Nami is also one of the few non-powerful combatants, always hiding behind, and if he hands it to Zoro, it would be strange that the hat will not be cut into strips.

I think this just gives Nami a kind of trust, telling Nami that everything will be left to me next, because Luffy knew how desperate Nami was at that time, so he wanted to give Nami a sense of security, because Nami is his companion, and he doesn't agree with what others say Luffy can do without anyone, but he can't be without Nami, One Piece's companion, Nami can't be less, and no one else can be less, because they are a team, and no one can be without them.

Luffy treats the hat as a treasure because of the red hair that gave it to him, and there is also a pact. Luffy put the hat on Nami's head because he believed in Nami, and because he saw Nami as a treasure like a hat. At the same time, Nami, who knew about Luffy's agreement with the redhead, also understood this truth when she was put on a hat by Luffy.

This is the first time, not to mention the back, because it is a partner.

At first, Nami was disdainful when she thought that Luffy's straw hat was his baby, and Nami thought that there could be no one who took the broken straw hat as a baby. But when Nami witnesses Luffy's angry attitude after the Straw Hat is destroyed by Bucky, Nami gradually changes her opinion, and at the same time realizes that the Straw Hat is indeed something very important to Luffy. When Luffy gave Nami a straw hat, Nami was so moved.

Because Nami is aware of the importance of the straw hat to Luffy, when Luffy buckles the straw hat on Nami's head, it also highlights Luffy's trust in Nami.

Luffy's trust and behavior towards Nami are rarely explained in words, typical of a domineering president. It's just that our president is still childlike, and Miss Nami was still a spoiled little princess one second, and the next moment she became a furious mother. After this action, Nami knew that Luffy was willing to gamble his life for her.

It's to give the straw hat to Nami for safekeeping, because he's going to fight, and then, the straw hat is a very important thing for Luffy, and she gave Nami custody to tell Nami, I trust you very much, and now you have to trust me, and finally, I feel like it's an invitation, and I invite Nami to join them.

Because that hat is worn by the future One Piece, and Luffy is the "man" who wants to become the One Piece