There is a current fashion and I'm not sure if it is the same across the UK or just localised where I am; but lots of females are wearing these leggings that look like a faux denim. What I don't understand is how these fashions grow and how organic a process it is. It could be that women all subscribe to the same magazine and one edition they told everyone to buy these leggings. It could be that most women all enjoy shopping in the same store and they buy whatever the "latest line" is. Or it could be that a few women wear them and other women look at these women and think "they look good, I'll get some" or maybe "lots of women are wearing these so I want to wear them also".
Whatever the reasons, whatever the origins, at some point these women are making a conscious decision to look the same as everyone else. It's one of those NT traits that I just don't get, I don't understand the thought process that makes people aspire to mediocrity.
It's not just these leggings, of course, it is most months (especially the Summer ones) in every year that eventually women largely walk around wearing the same thing. As always it was Oscar Wilde who coined it best; "Fashion is a form of ugliness so intolerable that we have to alter it every six months."