Fun Fiesta Mexican Poncho (35" X 55") Adult Size. Cinco the Mayo. Fun Fiesta Mexican Poncho. Bright stripes and fringe give this poncho a festive look! A Fun Fiesta Poncho is the perfect choice for a Southwestern theme party, Mexican dinner fiesta, Halloween costume or dress-up day. Choose this colorful cover-up for Cinco de Mayo! Polyester. 35" x 55" Imported.