I haven't read all the posts, but as an American who lived in the US for 22 years, and has been in Scandinavia for 20 now, I have some opinions.
Ooo, flametrap threads. Cool.
I find it hard to tell who's American because they rarely venture out of their own country...
This is often true, and for a reason that's often overlooked - - many families simply do not have the money to travel. When you're in Europe, even way up where I am, it's possible to get away for a weekend trip to somewhere else in Europe - and it's financially feasible, as well. People living in Europe simply have an easier time getting around. I love being able to zip over to London, down to Praha, just for a weekend.

Couldn't do that when I lived in the States.
My favorite are the americans that will travel to europe to experience the culture then eat at mcdonalds and tgi fridays the entire time they are there.
(Englishman in the US craving a chippy and a greggs)
I think this is pretty universal. I've travelled with Europeans who make a beeline for the nearest fast food place where ever they are.
Perhaps we should just stick to discussing clothing styles... lest this devolve further from the OP's question. Thanks.
I'm going to branch off a bit from this, because it seems to me that although it IS often quite easy to see where people are from, I think clothes play less and less of a role. I see the same sorts of clothes being sold everywhere. Clothing still can play a role of course - I can often tell a foreigner by his/her clothing, but I think globalisation is changing that to a certain extent.
One thing that's struck me about American tourists here in Norway is how truly interested they are in everything around them. Sure, a lot of the questions can sound weird (like building a castle under a flight path, as has been mentioned

), but they ASK questions. They have a sort of child-like enthusiasm, which I've come to respect. And some of those questions that sound so awful on first hearing are actually a matter of the locals not having a good enough grasp of English, and especially the way it's used in different places. "When do the fjords close?" is one they like to point out here to make fun of Americans. They don't realise that what is really being said, is "At what time of day is it no longer possible to get on a boat and take an organised trip on the fjord?" The American is just using a kind of short hand that everyone at home would understand.
Now, I don't mean to imply that everyone else in the world should be experts in English. On the contrary, everyone should learn languages. But I know from personal experience that it's often hard to try to use a language you're learning in its country of origin; soon as you open your mouth, the locals can hear you're American, and they are either quite rude to you (France) because they choose you as a target for everything they don't like about your country's politics, or decide that you've come all that way and spent all that money just so they can practise their English with you (most other places).

Only place I've really been encouraged by the locals to use their language was Shanghai.
This is a long post, sorry, but I've 20 years to think about this. In general, I say viva la difference.
