This thesis aims to investigate sustainable apparel purchasing habits from customers’ perspective with an emphasis on attitude-behaviour towards the phenomenon. Furthermore, the possible attitude-behaviour gaps are detected throughout the research, illustrating dissimilarities in sustainable apparel consumption and discrepancies between actual purchasing action and consumer attitude. The study analyses Swedish consumption patterns, within Millennials and Generation X consumers by using a qualitative research strategy, where participants have the ability to express their perceptions on the concept and evaluate on their post-purchases. Two chosen models are used as fundamental pillars in understanding essential purchasing actions. The findings contribute to the models while also develop theories based on them.