These would have been worn around the neck like the linked edan of Osugbo elders; the beaded birds on the straps are there to offer protection for one of a person’s most vulnerable pots, the nape of the neck.
Source: Drewal, H., Mason, J. (1998). “Beads, Body, and Soul – Art and Light in the Yoruba Universe”, Los Angeles: UCLA Fowler Museum of Cultural History. page 223