I seem to remember his clothes on that other world being a shirt that resembles the normal Superman shirt, but with orange pants with black pinstripes.
That's the one! Everyone's clothes had a distinctly '60s look about them. Very mod. I remember Kal-El's adopted sister, the villain of the story, wore a miniskirt and big hoop earrings. (When she wasn't wearing bearskins, of course).
You gotta love the Silver Age. Loopy stuff like that happened all the time and no one ever complained about continuity.
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