Q. What exactly does Jubba mean?

Answer

A long outer garment that looks like an open coat and has long sleeves; traditionally worn by public officials and professionals in Muslim nations together with white fabric robes, a black jubbah, and a gold sash. — John Buchan. Likewise written as jubbah. This Jabba is not related to that Hutt. One can easily see why a professor would rather not give a presentation in shorts: not only would the audience likely make fun of him or her, but also a magnificent gown is the universal symbol of respect in a conference setting. It's important to tailor "Jubba" to the way of life and special event, therefore many different styles exist.