Although Ali the Book Seller is a fairly minor character, he does have a few wardrobe differences in the game (depending on the version).
Ali's main clothing feature is the red fez hat that he wears. He is shown to be wearing a red vest with a dark blue shirt underneath. He is also shown to be wearing red vest with gold striping, with a turquoise shirt underneath, with gold trimming. He wears a pair of glasses with ear pieces.
He is also shown to wear red vest with gold striping, blue sleaves, and a white shirt with gold trim underneath. He wears a pair of spectacles balanced on his nose.
In KQ6 Amiga, Ali wears largely the same outfit as he does in the lowres KQ6, however, his shirt is a grey color with gold trimming.