Mirrored friends

I have the impression that friends tend over time to dress alike.

I was watching groups of people walking around at my local shopping centre tonight and was struck by how many pairs/groups of friends (I assume they were friends because they were shopping together and apparently happy with each others company) dress almost indentically.

Certainly the women I saw all were wearing different variations on the same theme. Same for the men. All pretty much wearing stuff along the same lines.

So why do we do that? Do we dress the same as our friends because we want to be comfortable with one another, or do we make friends with people who dress like us?

It's not an earth-shattering observation. It's just curious that for all the variety out there in terms of clothes, image and so forth that people who flock together all pretty much dress the same way.

What happened to all the rebellious dressers?