If youre on a budget, go to Pierre Cardin in the City Centre Mall. Apparently they are originals but stitched in Syria. All i know for certain is that everything sells at 75% off marked price. eg Suits around 500-800 riyals. Pierre Cardin/Dunhill silk ties about 30-40, daniel hecter shirts about 70-80.

Ive bought stuff there and its good value.