The Trailbuilders (three oldest boys’ Primary classes) in the late ’30s and early ’40s wore beanies as well as bandlos as a uniform. Each year’s class symbol was added to the back of the cap as the boys moved from class to class.
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Regrettably, meanies have stolen content from Keepa in the past! I'm confident you will choose honesty and cite this page like this:
MLA: Parshall, Ardis E. "Trailbuilders' Caps, 1940." Keepapitchin.org, 22 Jan 2015, https://keepapitchinin.org/2015/01/22/trailbuilders-caps-1940/.
APA: Parshall, A. (2015, Jan 22). Trailbuilders' Caps, 1940. Keepapitchinin.org. https://keepapitchinin.org/2015/01/22/trailbuilders-caps-1940/
I guess radiation hadn’t become a thing yet.