The important change is that it used to be a low-status activity, but now it's becoming a higher-status activity — at least until middle-class people get bored of instagramming their thrift-shop finds.

Although, the upper classes have always valued re-use and handing down. Alan Clark (not a man who would have thrived in today's political environment) once said: "The trouble with Michael Heseltine is that he had to buy his own furniture" i.e., he was lower class. There was a similarly snippy remark made about the furniture in Katherine Middleton's (Duchess of Cambridge) family home—it was too neat and new.

Here is a catchy tune that was a pop hit (topping Billboard Hot 100 in U.S.) ten years ago, it can be the inspiration for your next trip to the used clothing store, the message is timeless. (lyrics are NSFW)

https://youtu.be/QK8mJJJvaes

"The song's lyrics show Macklemore's esteem for thrift shops and saving money, rather than flaunting expensive items like many rappers. The song was met with universal acclaim, with various music reviewers praising its humorous lyrics and social critique. " [Wikipedia]