A keffiyeh is a rectangular piece of fabric traditionally worn by members of the Edot haMizrach and Arabs. However, none of the photos I've seen of B'nei Edot haMizrach and Teimanim wearing these garments (often in a turban rather than the styles associated with B'nei Yishmael) seem to have tzitzit attached to them, despite the fact that they are significantly larger than scarves.
This leads me to wonder: is a keffiyeh chayav [obligated in] tzitzit?