Why did kamikaze pilots wear helmets?

The obvious question is, why did kamikaze pilots wear helmets? After all, pilot safety wasn't really a consideration. I can't explain why the short guy on the end is smiling either - he must just be a happy guy.

Technically, they were not a helmet per se, they were a flight cap. So after re-framing the question, why did kamikaze pilots wear flight caps? The most obvious answer has nothing to do with pilot safety, it was mostly to keep his ears warm. I guess they wanted to treat their pilots well even though they were on a one-way flight - recruiting would have been difficult otherwise.

I was doing some reading and pilots during World War II would take off with their canopies open, I guess allowing a reasonably easy escape should they crash during take off. In the early days of World War II, they may have been following the traditions of more conventional pilots. Especially during the later stages of the war, kamikaze pilots were sent on one way flights when Japanese command knew all was lost.