Long flowing garment (5)
(Other definitions for cloak that I've seen before include "Loose outer garment" , "Sleeveless garment" , "Loose overgarment" , "Cover, hide" , "Garment - conceal" .)
(Other definitions for robe that I've seen before include "Loose garment for Boer" , "Loose outer garment" , "Clerical garment" , "Ceremonial garment, clothe" , "official dress" .)