At the Symposium of the International Research Network on Sustainable Fashion Consumption 2022, Jens Bergener and Maike Gossen gave a scientific speech to an international audience and presented the study design of a planned choice experiment. The empirical study is to identify sustainable and non-sustainable product attributes that have an impact on the purchase decision in an online shop. The findings from the study should help to design and place the sustainable purchase recommendations on the Ecosia shopping website in such a way that they influence sustainable consumption as effectively as possible.