Yes and no. While there's ANH concept art of Ben's costume that looks decidedly more "Jedi" like; what they ended up on was basically desert cloak hiding the very tatty and old Jedi robes underneath. (See Also: Yoda)I should note that at the time ROTJ was made, Luke was wearing clothes Lucas envisioned was standard for the Jedi during their heyday. At the time he imagined the all black clothes as traditional Jedi dress. It was only later that Obi-Wan's robes became the inspiration for Jedi clothes. At the time of filming, Obi-Wan was wearing standard Tatooine robes (just like Uncle Owen).
Likewise, I think there's also some RotJ concept art of Luke's costume that seems much closer to what Ben was wearing (and kind a like what he ended up wearing in TFA.)
The idea that Jedi clothing was meant to look humble and low key seems to have been fairly pervasive, even if they did later dial it back even closer to the iconic Ben Kenobi look than was absolutely necessary.
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