Is this a photograph of a time-traveler?

Retronaut says, "This picture is 'Reopening of the South Fork Bridge after flood in Nov. 1940 / 1941' at the Bralorne-Pioneer Museum in British Columbia, Canada." Now look at the third guy from the right in the rear row.

Is this photoshopped? I don't know. According to Wikipedia the first t-shirts with graphic designs on them appeared in the 1950s but I don't think that's a t-shirt. Looks more like a sweater to me. Those sun glasses look awfully modern though. I sure would love to know more about this.