This is where colour alteration can be a radical change.

I suggested some pages back (and I'm sure other people must have thought of this too) that the robes should be recoloured to tie in more with what Luke wears in ROTJ (black under tunic and boots with a dark brown hooded cloak).

The designs could be very different but the colour scheme stay the same.

Obi-Wan in the OT is dressed to fit in with what the moisture farmers on Tatooine wear so there is no reason why all the Jedi, in their prime, have to dress like that when they aren't undercover on Tatooine, unless we are meant to believe that Obi-Wan chose Tatooine to place Luke and hide so he can wear the same set of clothes for the next two decades.