Cameron

Calculon

Um, maybe it has something to do with 'bringing balance to the force'?

B.A.

Vertical stripes are more slimming than black.

Cusm

I thought (and this is going back 20 years) Lucas said something about flipping the standard black=evil guy white=good guy of the old western serials, ala Stormtroopers=white, and he wanted his good guy to wear black in the end to balance that.

Giles

and I still wear mine.

raven56706

Luke was still going through his Gothic years

devilshalo

Oh wait...

Jadow

he was putting on some weight, and black is "slimming"

GuessWho

to sum up

a) luke wears black to parallel his father's destiny
b) there are no other jedi to tell him what to wear/he has no idea there's a jedi dress code
c) we all thought ben's outfit was standard tattooine fashion (see uncle owen's duds), but then our childhood was raped when we learned in 1999 that those are jedi robes