This study aims to identify the meaning and formation cause of a style, and the essential elements of style formation, through psychobiological research as well as an analysis of the designs of Iris Van Herpen, a fashion designer, who in just 6 years has developed into a world-renowned new designer. As a result, it has been found that the psychobiological causes to form a style stem from the action of ``long-term memory``, which is consolidated by ``selective attention``, ``perceptional subjectivity``, the principle of the ``neuron`s connection specificity and invariance``, and the principle of a ``neuronal signal`s unilateral flow``. With such action, Herpen could develop her own original composition techniques. The formative shapes created by such composition techniques are characterized by enumeration, superposition, and hanging. The study has also found that the essential elements for a designer to be able to form his/her own style include ``aesthetic originality`` in which the designer views the property of a thing from his/her inherent perspective, and finds the uniqueness from the thing that only he/she can express, ``technical differences`` that are creative and original, and ``formative specificity`` that is summarized into one property through an impressive shape.