Azizi-

With regard to Ethiopia and Eritria:

The harp-like stringed instrument with the gourd head, banjo-like, is generally known as a krar. There are also one-stringed fiddles known as masinkos.

The white dress is traditional formal wear for all special occasions. They generally are fringed with brightly colored borders with intricate needlework.

In the Gurage area the only instruments I observed were small drums.

Cheerily,
Charley Noble