Cowboy Hat

A Cowboy Hat can be produced on a Landleven farm by feeding daisy (costing 25 coins to plant) to a Cowboy Ostrich, believe it or not. The hat can then be sold for 48.

However, a Leather Machine can combine it with various other things to produce items of leather goods. For example, combining with Angora Hair produces a Leather Glove worth 155.

According to the popup that shows in the barn if you have a hat, it is "Used to craft Leather and Leather in the Workshop". That needs further investigation.