Well now, I love me a good trend, a right proper fad. I like to know what's going on, be where the people are at, see what's occupying the multitudes, and stay conversant. I want the proverbial Rubik's cube. I want Sage The Gemini on my playlist and buffalo plaid everything. I want to be like my friends. I think shared experiences are important and meaningful at the mass level.
But I don't simply want what everyone else is having for the mere sake of having it. I don't have Angry Birds downloaded to my giant smartphone. That would be a waste of computer memory for me. A trendy thing has to capture my personal imagination as well. I've never owned an iPod, only Nanos. Also, Apple products form my entertainment system; I don't compute with Apple.
Now I must say, I think age has a lot to do with wanting to follow the trends. Or more specifically, living in a fishbowl, like highschool, is important to the development of persuasive trends. Fishbowls can be cross pollinated, but all trend following is local and immediate. It is much easier to elude such fishbowls as an adult; it is impossible to do so as a teen.
In terms of fashion trends/fads, I'd also like to say I agree with Anna. The way I describe it - I see fashion floundering at the moment. We are in want of a fishbowl. Haute couture is dead. Fashion mags are dying. The blogosphere does not a fishbowl make... A bubble for the bloggers themselves maybe, but not a fishbowl... There are a lot of fake trends and trends people can't get off the ground. I, at least, am hard pressed to identify a really serious fad of late. Hard to jump on a bandwagon that isn't there.
Culottes, btw, I don't think are *a* trend. As in being a fad, being trendy. I think they are *current,* as in a long term trend. Trendy fads are more specific, IMHO, by definition: like 'feathers'...