there were stillsuit hoods of dull grey , garments of fremen from the deep desert ; there were white-robed pilgrims with penitence marks on their shoulders ; there were scattered pockets of rich merchants , hoodless in light clothing to flaunt their disdain for water loss in arrakeen 's parching air ... and there was the delegation from the society of the faithful , green robed and heavily hooded , standing aloof within the sanctity of their own group .