A. Literally, Tzitzit refers to the fringes themselves, while Tallis is the cloak-cloth part we wear. But in today’s common religious lingo, Tallis refers to the larger outer garment (prayer-shawl), worn over one’s clothing during prayer. Tzitzit refers to a smaller garment, worn underneath the shirt, with the fringes tucked in or out (depending on custom) throughout the day. Not as many people are as familiar with the Tzitzit as with the Tallit.
