
[The above are French couples, btw

]
Feel free to believe what you want about shorts. Shorts seem to have a place and an AGE in other cultures.
(Personally, I couldn't care less, having lived in Southern California for almost 20 years, I wear shorts all the time but at work, and I look just like one of the French people in the picture above, pretty much, darker skin and hair though).
Like I said before, it's not all about clothes. If one is seeking to not look American.
I was in Canada a few week ago (Toronto). And a couple of women were trying to buy soda from a vending machine and they kept trying and trying to use a US dollar bill. I told them that the machine only accepts Canadian Dollars but they insisted to try with a US dollar bill one more time.