Women (rare: men) who possess supernatural power and usually come from a non-human world (from sky, from under the water, they are winged beings, bird- or animal-persons; rare: a girl of higher social status than the hero) take off their clothes (feather skins and the like) or part of it. Because a person hides the clothes (of one of them), their owner(s) have (has) to marry him or help him (rare: her)
Magic wife abandons her mortal husband when she finds her clothes (often, her feathers if she is a bird-woman), makes herself the new clothes, receives them from her kin or her husband gives her her clothing believing that she will not abandon him. (Versions with magic wife abandoning her husband because she feels herself offended is not alternative to the “found clothes but in most of the texts these motifs are not combined)