Earlier quoted context omitted.
I'd love to see the research behind that. I don't know where Americans rank, but I wouldn't guess we rank high.
Personal experience from travel in Iceland, Peru, UK (mostly Scotland), and Italy. Obviously generalizations and anecdotes, so take with a grain of salt. Americans often stand out. Look more "touristy" - wearing shorts, goofy bags, unstylish footwear, etc. Most likely to ask "what do you do?" (for a living). Not rude, but can be more boisterous/social than some others. Chinese - tend to travel in large tour groups. F…
Interesting. When I travel, I usually dress the same out in public as I do at home (well, modified for the local weather, anyway). Usually that means jeans, t-shirt, and possibly a hoodie and/or jacket if the weather is cooler, with fairly plain sneakers or perhaps a nicer shoe, depending on how much walking I expect to be doing. I tend to not carry a bag with me unless I'm going to or from an airport or train station. If I do need a bag, it'll usually be a backpack or shoulder bag, something I would use at home for a similar purpose.
I do expect that there are a lot of us who inexplicably dress differently when traveling, but I wonder if your assessment of American tourist dress as "goofy" or "unstylish" is just that the styles that are popular over here aren't popular where you live and where you've traveled and seen American tourists.
I really don't get why some people drastically change their wardrobe when traveling, though.