One of the most under appreciated articles of clothing in WAM fashion I feel is the hat. These could range anywhere from baseball caps to the large wide brimmed and decorated ones of the early 20th century. for something that was rather ubiquitous in fashion for 100 years (at least here in the US) I rarely see them. They also act as a filling mechanism which can also keep the mud in place. So why do they not get the love (I at least) feel they deserve.
I'm a bit late to the party but want to agree with everyone else who likes hats in WAM! I've worn baseball caps multiple times showering fully clothed, in the mud and during a sliming. It was hard to keep track of the hat in the mud but felt incredible to wear while swimming and soaking. Even standing under the shower in a baseball hat watching the water go down the sides of the hat onto my jeans was incredible. From a modeling perspective it was much easier to take selfies wearing a hat because it kept the phone dry.
I don't have experience with formal hats due to their price.