This study offers a new perspective on clothing consumption by uncovering the systemic nature of the wardrobe. The research builds on systems theory and aims at drawing a map of the wardrobe as a system with particular structure and behaviour. By co-designing fictional 'smart wardrobe' services with experts and discussing these services with wardrobe users, we identify characteristics of wardrobe structure and behaviour that give input for a preliminary wardrobe map. Lastly, the wardrobe map provides a basis for discussing sustainable design approaches aimed at reducing clothing demand, in the context of growing clothing production volume and its associated environmental impacts.