Now as I live in Nagoya, let me explain about secondhand clothes trends in Nagoya. The most famous place for secondhand clothes in Nagoya is Ohsu. A lot of secondhand clothes shops are located there. Most shops do not have doors but instead they decorate clothes all over the place. When I went to Ohsu,I found lots of cheap secondhand clothes.
Popular items are sweats, coat, windbreaker, jeans pants.
The clothes from the 1970s are the most popular because they are cheap. There are clothes even from the 1950s and 1960s too. But jeans are a little different. Secondhand jeans are divided into ordinary clothes and vintage. Feedback from overseas I enjoyed while reading your essay.