Check out this awesome collection of men’s swimming trunks from the 1920s to the 40s from Vintage Haberdasher’s blog. Interestingly they range in colours from black to yellow but there seems to be a preference for the darker colour choices. Most were made from wool with a canvas belt to keep them from sagging and falling off once heavy with water and many have a little coin pocket included in the design.
*This article is shared from my personal blog
1930s Janzten ad