Uchiha Sasuke is a Kage of a new village in his own right. All the refugees and war orphans live under him. Any vagabonds or runaways find safe haven with him. The whole of Otogakure is also with him. His subjects have showered him with gifts because he is very loved by the people he allowed to live without being stigmatized for what they lost or what they did.
The cloak belonged to Juugo who died. The headband was a gift of a very grateful family who was able to not have to split apart and form new bonds with separate villages or starve.
Then there are three siblings in Otogakure who lost their parents to experiments, but they themselves were unable to form or use chakra or any elements, not even Tai Jutsu when Sasuke asked them to demonstrate. He took them in. They could not believe that someone would treat the useless three with kindness so they took their mother’s chains and gave them to Sasuke. They told them “the person who wore these chains took care of us; we want you to have them”.
Since he rarely sees them because they truly are useless, he always wears the chains because deep down in side, he was incredibly touched.