Akton said:

ZkinandBonez said:

Also people tend to forget that Luke's black outfit in ROTJ was supposed to represent his brush with the dark side. Of course him actually tuning evil was eventually written out, but Luke did have his dark side moment while fighting Vader in the end.
As far as the lore is concerned I can't remember having ever read that it was supposed to be an actual Jedi outfit. I'm pretty sure it was just something he put together before meeting Jabba (even the pre-PT EU added a practical explanation for the outfit.)
And of course when we see Anakin (Sebastian Shaw) at the end of ROTJ he's wearing the same moisture farmer outfit that Obi-Wan wore in ANH. Not to mention that Yoda more or less wears the same outfit. I don't actually now if this is a pre- or post-PT thing, but the reasoning behind the Jedi both in the OT and PT wearing moisture farmer outfits, or rather just a casual outfit common among colonists and farmers, were because they were supposed to be ascetics; monks more or less. Hence the humble outfits.
And Lucas was quite adamant back in the pre-PT days that the Jedi order was basically just warrior Buddhist monks, even comparing them to Yogis once.

I certainly took Luke's ROTJ outfit as a "Jedi uniform," and, given the context of the film, it seems were were meant to. Yes, he resembles Vader, and there is thematic significance to that. But I always saw the primary, in-universe reason for that similarity being the simple fact that Vader was once a Jedi too; thus he continued to dress more or less like a Jedi, and continued to carry and use what Palpy disparagingly referred to as "a Jedi's weapon." I mean, why else would Luke make his first public appearance as a Jedi (that's how he introduced himself to Jabba) dressed in such a strikingly distinctive uniform? The fact that the outfit strongly resembles a priest's cassock also cemented the idea (in my mind at least) that this was indeed a "Jedi uniform."

As to Anakin's ghost wearing Tatooinian robes - well, Anakin was a Tatooinian. So, there's that.

Yoda's garb was fairly different from Anakin / Obi-Wan's - much more generic hobo / hermit clothing - very rudimentary. Also, I'm of the opinion that Yoda - being a Jedi master (not a Jedi Knight) - would not have worn the militaristic uniform of a Jedi Knight, nor would he have ever carried a lightsaber. That was also Lucas' opinion back in the OT days, as evidenced by the Rinzler books.

Well, the EU certainly seems to have agreed with your militaristic uniform idea:

The Dark Horse comics of the early 90's seems to have interpreted Darth Vader's outfit, minus the robotic parts, as having been a Jedi uniform.

However the Jedis couldn't exactly have walked around in full armour all the time, and who knows what they were originally supposed to have worn. Also I'm not sure if I buy the whole thing about Anakin having been born on Tatooine, hence the outfit on his ghost. Even the PT had the Jedi's wear different uniforms, and even express different ideologies through clothing, so I don't see why the pre-PT lore couldn't have gone for a similar thing.
Also it kind of makes sense for the not-quite-a-Jedi-yet Luke, and Darth Vader to wear black uniforms, while the Jedi masters; Yoda and Obi-Wan wears simple garbs. Anakin of course turning to the good side towards the end could also explain why he's wearing a ascetic outfit as a spirit. And of course by the time of TFA Luke would have become a master, so it only makes sense he's be out of his black uniform. He's also, according to the rumours, hiding on some planet in deep meditation, trying hide is destructive force powers form the world around him. That's quite an ascetic thing to do, and far away from the brash, close to turning to the dark-side young farm-boy from the OT. All the OT film had Luke gradually mature from a cocky and adventurous farm-boy to a more mature, and conflicted Jedi knight. It only makes sense that he 30 years later would have more of a Jedi master vibe to him. Abrams even pointed out that a lot of the film would focus on the question; "who is Luke Skywalker," and this is a very logical next step in his character development.