In a group, students require to do research on the sustainable consumption of fashion merchandise among Malaysians. In the research, students need to identify the consumer behavior towards the marketing strategies by the retailers that encourage sustainable consumption and behavior in buying fashion products. This research should focus on the marketing strategies involved in the following process:

1. Pre-purchase behavior
2. Purchase behavior- purchase decision
3. Post-purchase behavior

Based on your research, provide a sustainable buying behavior model for consumers in Malaysia.