Reiss Design Association. Average difficulty sewing pattern for Pet hats in three sizes have hook and loop closure under the chin, ear holes and bunny ears, heart antennae, plush antlers and top hats with ribbon bands. Beret style hats in three sizes have ear holes and plush stem details. Bib style bandanas with hook and loop closures have pointed or round shapes and assorted holiday embellishments. Hats fit heads S (12"-15"), M (15"-18"), L (18"-21").