Trenchers
These are stiff shaped hats with a flat board on the top and a tassel. Trenchers are always black.
The trencher is worn with the shorter peak to the front and the tassel should be over the left eye. The hat should sit comfortably so that it isn’t slipping.
PhD and other doctorate recipients need to wear a tudor bonnet. These come in three multi-fit sizes. The Bonnet should sit comfortably.The bonnets come with a gold tassel.