This hat fits my kitten, Thor, who is 4-months old. To ensure it fits your cat, please check the finished measurements before starting the project. Happy crocheting! -Melissa

Measurements
Flat across the front = 6 inches

Front space between ears = 1 inch

Back space between ears = 2.5 inches

Ear hole width = 2 inches

Hat height = 2.75 inches (not including the pom)