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Poppies, tulips and roses in a vase by strawberries and grapes on a wooden shelf, 1846

Les Dames Goldsmith, 1901

After leaving with Orochimaru and severing his ties with Konoha, Sasuke became a wandering swordsman, a rōnin who lives strictly by his own code, seeking revenge. Such a crucial change needed to be shown to the reader through his appearance and demeanor.

In anime and films, a swordsman with an open shirt and an exposed chest represents a dangerous, reckless, and informal fighter. That detail accentuates Sasuke’s confidence and recklessness, showing that he doesn't care about heavy armor and isn’t afraid to expose his vital organs to the opponent’s attack.

Other rōnin characters, such as Zoro from One piece, Jubei Kibagami from Ninja Scroll, Shinsuke Takasugi from Gintama, Manji from Blade of the immortal, Yasuke, also wear clothing that exposes their body and leaves them defenseless, making them look even more intimidating and dangerous.

Sasuke uses a katana—a chokutō sword, if being more specific—which was commonly used by samurai.

Many fans often associate his rope belt with Orochimaru, but it became a practical part of his clothing that functions as a sword sash. This also explains why Sasuke kept wearing the rope even after killing Orochimaru and being on his own.

Sasuke’s armored sleeves from early shippuden era are called kote. Kote is a gauntlet that covers the back of the hand while leaving the fingers free, they’re a part of Samurai armor.

Aside from appearance, a huge part of Sasuke’s character is his reserved and stoic demeanor. His calm confidence and his unwavering determination all contribute to the image of a wandering swordsman.

Some people reduce Sasuke to someone who’s “easily manipulated”, but one of his defining traits is that he has his own code. While training under Orochimaru, Sasuke refused to kill the shinobi he encountered, because it contradicted his worldview and principles. He used Orochimaru to get stronger but never adopted his philosophy.

Also, during that training, he defeated a thousand shinobi single-handedly, demonstrating his immense strength and impressive skills.

While Sasuke doesn’t explicitly follow what is conventionally known as bushido, he still demonstrates a strict internal code and personal philosophy that he abides by, expecting the members of his team, Hebi, to abide by it as well.