This challenge is all about working on the fine art of "intentional buying" which is just a fancy way of saying "think before you buy". There are loads of reasons to avoid accumulating a load of stuff you don't need, but the two most compelling ones are to avoid contributing to child labour and large-scale pollution.
POLLUTION & WATER WASTE
2 billion pairs of jeans are produced every year, and a typical pair takes 7,000 litres of water to produce. That’s the amount of water an average person drinks over the course of 9 years. Then, there’s the dyeing process using 1.7 million tonnes of various chemicals, not to mention the hazardous chemicals like PFCs.