The Top Hat is an accessory that can be worn by golems. It increases the health of any wearing golem, regardless of type, by 3 hearts(6 health points).
Thaumonomicon Entry[]
"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."
Recipe[]
For the aspects you'll need 8 Ordo and 8 Ignis.