Guys - just so you know, this is actually a bug in the game (appeared last year, I reported it, was never fixed and I reported it again this year HERE).
The top image Beast has posted is correct, it is left sleeve then right sleeve - see attached SI's own 3D texture for Blackburn as evidence - their right sleeve is the blue one.
Beast72
As you can see it indicates which is the L sleeve & which is the R one.
Turns out this is wrong
I've updated 5 kits - Palace, Norwich, Bristol City away, Blackburn home & Dagenham home - hammer should be on with updating the English packs
hammer9
Korvin
Fidney
The top image Beast has posted is correct, it is left sleeve then right sleeve - see attached SI's own 3D texture for Blackburn as evidence - their right sleeve is the blue one.
Beast72
AlexDepa
Beast72
use the in-game editor