For those who know more Star Wars minutia than me:

At the end of A New Hope, Luke Skywalker is wearing brown pants with a yellow stripe. Han Solo wears black pants with a red stripe. In The Empire Strikes Back, Han wears brown pants with a yellow stripe (and again in ROTJ).

I thought the Corellian bloodstripe was reserved for Corellians. How did Luke manage to wear the yellow one?

Or was is simply a costuming issue at the time, before anyone realized that years later people would be analyzing all the small details in these films:)

--11MBStarWalker

Well, the pants Luke are wearing in ANH are different from the ones Han is wearing in ESB and ROTJ. I always thought of Han's pants as more like a faded version of his pants from ANH. It is 3.5 years between ANH and ESB.

Otherwise, you're probably right. Costumes available at the time, and the whole "Correlian Blood Stripe" thing was retconned later.

Lobo hit it on the nail head.

The reason generally excepted came from the costume dept at the time as they were out of budget and could not design anything more, so they mearly used a second set of han pants, redied them to match luke's color pallete then fixed thier fit, figuring no one would ever notice.

I liked to think about issues like this in terms of "in Universe"

If you thinks about the state of Luke Skywalker's affairs... he sold the only "Viable " possession he had and followed Ben-
what else did he have with Him?

Skip forward to the end of Empire, we see Lando clearly wearing Hans cloths...

What’s to say Luke didn't do the same?
or rather
there were an awful lot of people at Yavin, perhaps someone there, a Corellian even, lent the hero of Yavin, Luke Skywalker, some cloths to get him through the ceremony

Here's some more info on the Corellian Bloodstripe.

I always thought Han stopped wearing the red stripe due to that it made him more of a target (that's not a good idea for someone with a Hutt's bounty on his head).