Why were Brodie helmets often tilted to one side or the other?

I've long wondered why Brodie-style helmets (including the American M1917 helmet) were often worn at what appears to be a spectacularly jaunty angle. I've noticed in historical photos that they usually, but not always, noticeably tilted with the right side down.

For visual context, here's a photo from the UK's National Army Museum of troops on the western front in 1916. Scanning the crowd, most helmets appear to be visibly tilted to some degree or other - One soldier towards the top-right of the image seems to be facing the camera directly, and his helmet is tilted with the left side down almost at a 45 degree angle.

This wasn't limited to UK/Commonwealth troops either, for example Wikipedia's page on the Brodie shows this image of Norwegian troops in 1940. Three of the group wear Brodies, and two of them are tilted to the right.

Some googling found me this question from 2016 asking essentially the same thing. Unfortunately, the only answer is not up to this sub's present standards.

Why were Brodie helmets worn at odd angles? Was there some practical reason, or was it simply an effect of how the helmet fit on peoples' heads?