A forehead protector (額当て, Hitai-ate) is a headband composed of a metal plate and a band of cloth.
The reason is, is that when he was training with jiriah, jiriah's training was careless which made the headband fall and made naruto have to buy a new replacement which was a black cloth.
It seems more likely that the changes were just done as a part of the stylistic/look changes post-timeskip. Possibly Naruto's head band changes to match his new color scheme from navy to black. Ino and Sakura both were training in medical ninjutsu so maybe that's why it's red.
This headband is worn by ninja of the Land of Fire in the Konoha Village. The symbol is a stylized leaf to symbolize the Village Hidden in the Leaves. The main characters Naruto, Sasuke, Sakura, and Kakashi wear similar headbands! The band is blue, and is approx 32.5 inches x 3 inches.
It got destroyed (save for the jacket which if you remember Boruto wore when he joined Sasuke, Naruto & the Kage to battle Momoshiki) during his time and training with Jiraiya. I guess it was a need for a change and also a sign of his maturing and getting older.
Black: Many ninja also wear black headbands such as Kakashi Hatake, Neji Hyūga, Gaara, Sai and Temari. Many ninja changed from blue to black over the time skip, including Naruto Uzumaki, Tenten, Iruka Umino, and all of Team Kurenai.
He wears a dark blue mask that covers the lower half of his face and sometimes the whole left eye too. Kakashi Hatake always wears a dark long sleeve shirt, dark blue pants, and a flak jacket or vest, which is the standard infantry clothing for Konoha.
Sage mode itself has no features other than toad eyes and the ring marks. That´s all. The cape is literally a physical piece of cloth that looks cool. And that is all it is and why Naruto has it.
Kakashi Hatake always wears a dark long sleeve shirt, dark blue pants, and a flak jacket or vest, which is the standard infantry clothing for Konoha. He also wears black, shiny fingerless gloves with metal plates on the backhand and chain necklace underneath.
Kakashi in his youth. Kakashi is a shinobi, with spiky silver hair, and has dark-coloured eyes.
The back of Naruto's Hokage cloak translates into “Seventh Hokage” whereas Minato's Hokage cloak translates into “Fourth Hokage”.
Natsu is one of the strongest mages of Fairy Tail, and of course, the hero of the series aside from Lucy. Natsu is an S-class wizard of Fairy Tail who loves a good fight against enemies and friends alike.
One Piece: 10 Strongest Characters In The Four Emperors Saga1 Kaido. Known to be the strongest creature on land, air, and sea, Kaido is one of the Four Emperors, just like Big Mom, and has a bounty of 4,611,100,000 Berries on his head.2 Big Mom. 3 Issho. 4 Marco. 5 Ryokugyu. 6 Monkey D. 7 Charlotte Katakuri. 8 Sabo.
Known as the world's "Strongest Creature", Kaido of the Beasts is a powerful Zoan-type user who occupies Wano Country and is an Emperor of the New World. Updated on November 30, 2021, by By Rei Penber: Kaido's Mythical Zoan Uo Uo no Mi, Model: Seiryu remains to be one of the strongest Devil Fruits in the story.