Usually something like this would go in off topic, so i'll just assume a moderator will move it there soon. But to answer your question, the FISD and 501st don't base their costuming criteria for the average stormtrooper on video games, rather actual screen used armor, so you can see why the lore in TFU doesn't really apply with the legion's ANH TK reference. Now for the TK commander (which i think is what you're refering to) which has blue stripes and such, the legion does base their costume criteria for that character on TFU; but if we're talking about the same thing, it isn't jedi armor, it's essentially either ANH or ESB or some other variation with the color added to denote rank.