My partner managed a denim store while at university for many years, selling various types of jeans, jackets, shirts, raw, washed, stretch, everything. I would stop in often to loiter, hang out, try things on, and see her. She taught me a lot about denim, the different weights, and the different cuts. By this point it was all learning, I was always a fan of denim, but didn't really know why.
One of the first things men get into with fashion is often selvedge denim, and Japanese denim in particular. It's a palatable note of quality, longevity and timeless style. I, like many men, went through my phase of Red Wing boots and selvedge denim, and although it felt like a phase, for most of us it was a time of understanding quality of quantity, and where our garments came from. One of those places is Kojima.
Kojima is known as the Japanese home of denim. There's the 'Denim Street' a street lined with denim stores, jeans hanging from powerlines, indigo coffee, and anything else they could come up with. Although the Denim Street is fun, it's more a tourism thing than anything, and the real business happens not too far away at the numerous factories producing denim fabric and finished garments.