The police took action after a report earlier in the evening that a person was sleeping on the quay. After the clothing was found, a major alarm was raised.
Several police units, fire brigades, diving teams, an ambulance and an air ambulance were urgently called to help with the search.
Burgernet calls on people to be on the lookout for a 38-year-old man. He has light-tan skin, dark hair and was wearing a dark-colored padded jacket and sweatpants.