Doctor Strange: "You are the right person to replace Logan."
X-23: "I know there are people who disapprove... Guys on the Internet mainly."
(All-New Wolverine #4)
Should GL's wear normal clothes under their Corps. uniform or not?
Early on it was the other way around. Until like, the mid 70's Hal often changed into his GL uniform by doing the classic Superman, open shirt to show his GL uniform underneath it. though where his gloves came from was never addressed, and having the boots on with the socks and shoes over them had to be a thing...
And I think it wasn't till the late 80s that the unform become a ring construct but was instead a physical thing they put on and could use the ring to change into. but it wouldn't go away when the ring lost its change since it exists independent of it.
Post silver age, when the uniform was clothes Hal had to change into, I never thought the GL uniform went over their civvies - the uniform is so skin-tight, there's no room for anything other than underwear. I always figured the ring changed their clothes into the uniform (or swapped into some pocket dimension, or in the ring, whatever) and if a charge ran out, it would revert back.
Yeah, when they finally had the uniform tied to ring power. (Which took... a while it might not have firmly been a thing till the 90s...) I think they just, didn't think about the logistics of it too much. Rings running out of energy or being drained or removed or whatever is a stable of GL stories and they didn't want their heroes becoming naked every single time that happened, so they change back to their civvies. How that worked with the skin-tight uniforms? (well, for the most part, there are exceptions like Guy) Doesn't really matter.