NYFASHION101 Kentucky Derby Enlarged Sheer Floral Accent Sinamay Dress Hat One size fits most for this wide layered brim Kentucky Derby dress hat. Fully measured: 22.5" x 19.0", Height: 5.5" Material: 100% Sinamay Enlarged sheer floral accent to grab the attention wherever this is worn. Great for Sunday brunches, picnics, or the seat at the Kentucky Derby!