I just became aware of the terms "slow fashion" and "fast fashion" in the last couple of years. It's one of those things that once you know about, you can't believe you didn't know sooner. It's a very complex concept with many different criteria to determine if an article of clothing qualifies as slow fashion. In a nutshell, investing in slow fashion is to be a conscious consumer of fashion that does not cause harm to the environment or people involved in the process.