This depends. Some wear armbands to stop the sweat from dripping down their hands, wear it to look cool... and lastly, some wear armbands to protect their arm from rubbing/sticking against the bass.
Black armbands used to be warn during mourning, but they are rare now.
some do i am sure.
It's up to your school.
To segregate them.
Magnetic bands for balance
They wear them as part of their uniform, in most cases to resemble an old time dealer.
Do you mean on their t-shirts? If so, they are attached to the shirt.
Kings and queens wear armbands made of gold and silver.
yes
Thhey usually wore togas and golden armbands. They usually were naked though.
They wore black armbands in memory of former Chelsea and Manchester United manager Dave Sexton, who died at the age of 82.