The purpose of this study is to investigate changes in consumer behavior and purchasing patterns during the COVID-19 crisis. This research is about the impact of COVID-19 on consumer shopping behavior regarding the population who was staying in İstanbul between the 1st of December 2020 and the 1st of June 2021. Nowadays, our consumption’s frequencies have been changing. As we become more encouraged to purchase more online than what we used to be before COVID-19 with such an impulsive behavior. Concerning clothes, people purchasing in-doors clothes more than out-doors clothes because of lockdown regulations, which state the necessity of staying home. In this context, a review of the literature on COVID-19 and consumer behavior is conducted. The study's goal is to analyze how COVID-19 changed consumer-purchasing behavior. The quantitative research techniques are employed. The primary data was gathered from İstanbul residents. A structured questionnaire was suitable for this research. The sample size was 150, and the sample consisted of consumers who stayed in İstanbul between December 1, 2020 and June 1, 2021. According to the findings of the study, the independent variable has a significant influence on the purchasing and pondering patterns of customers.