Notwithstanding the positive environmental impact of recycled plastics, they are only scarcely used in new designs due to unfamiliarity and lack of material identities. This research aims to touch upon the sensorial attributes that characterise the sustainable perception of recycled plastics. Understanding this would allow to respond to the new trend of sustainable living by offering recycled materials that are successfully perceived as sustainable, and that could support the identity building of each specific recycled plastic material. Three research activities were executed to explore (i) the designerly understanding of sustainable perceived plastics; (ii) the consumer understanding of sensorial material attributes that influence the sustainable perception; (iii) the understanding of these attributes towards recycled plastic materials. Five variables were found that interfere with the perception of the participants: A weaker colour intensity, the use of colourless colours, a rougher texture, a speckled structure and the usage of a matte gloss can give a sustainable look towards a sustainable plastic material. Further research should detail these variables, its limitations and try to make defined guidelines to avoid greenwashing.