General answer: Some do, some don't. Personal preference. That is what life is all about, if we all conformed to the same rules and values, we'd be a fecking boring bunch…
Edit. In English we have a saying, "variety is the spice of life".
When I sell stuff I like to understand the sizing, construction, how the item ages, how it changes over time etc etc, which is one of the reasons I hardly ever wear anything but Iron Heart. It allows me to get better at what I do.