Tiny hat is an accessory which can be worn by the golem. It increases its health by 3 (6 half-hearts).
Thaumonomicon Entry Edit
"This tiny hat is the perfect accessory for any golem. Not only is it stylish and dashing, but any golem wearing it will have increased health and vitality."
For the aspects you'll need 8 Ordo and 8 Ignis.