Editor’s Note: Check out the 2016 Shop Drop Challenge!Last year, I discovered that 160 million American women spend an average of $60 each month on clothes, while dumping six pounds of textile waste into the landfill. That’s $10 billion and one billion pounds of trash—every month. I was so floored by those numbers that I started the Shop Drop Challenge and 500 of you joined me, saving an average of $30,000 and 3,000 pounds of waste in just one month. Not bad, right? But more than that, many of you reported that the experience changed the way you thought about shopping—you started buying less, thrifting and swapping more. This year,…