What I find interesting is that Luke’s outfit in TFA is almost exactly his outfit in ROTJ, just colored differently.
There’s always debate as to whether the robes and tunic are actually a part of the Jedi uniform (as the PT suggests) or rather the garb of Tatooine dwellers and hermits. Luke being a hermit in TFA doesn’t help either way. Perhaps Rey’s eventual Jedi costuming will prove one way or another (though it is probably likely that she’ll keep the outfit from the end of TFA throughout VIII).
The robes and tunic were definitely Obi-Wan’s Jedi uniform in SW 1977 - all the script drafts for the first film describe the Jedi and Sith wearing such outfits. John Mollo even produced a separate design for Ben Kenobi’s Tatooine farmer gear, but this was cut due to budget reasons.
Nonetheless, the 1977 Jedi robes are clearly close enough to Tatooine farmer attire to pass casual scrutiny. Doesn’t mean they’re identical with it, though.