Although it's shown for pretty much just a few minutes in the saga, it's kind of interesting that this-the yellow jacket, black shirt seems to be Luke's default look (or variations of it) for the period between ANH and ESB.
It seems to go back all the way to the Holiday special's cartoon, but then started to show up in both the Newspaper and Marvel comics. I'm not too sure if it was a big deal in the Dark Horse comics, but of course once Marvel got publishing the comics again, the uniform was front-and-center on issue #1:
https://starwars.fandom.com/wiki/Sta...al_Edition.jpg