(great) outfits from behind
Each morning, on my way to the office, I have noticed that this is the season of tourism.
Each day I blast through small crowds of visitors with their maps (always maps!) and their backpacks and comfortable shoes.
Each day I marvel at how different they are from the locals.
Observe:

The unofficial uniform of the city. Great belt. Fabulous cuff bracelet. Comfortable yet chic shoes. (not shown)
vs.

A man in white shorts and running shoes. Also, they were holding hands. Unusual behavior here at 8:05am.

Summer art school students. In florals and bright colors. Clearly from out of town.
'
Shorts and white tee shirts? White tennis shoes? Not From Here.

A whole family in shorts and white tee shirts and SANDALS. Sandals are a very dangerous business in my city. One oughtn't wear sandals here.
Narrow, fitted short pants and sandals? AND a fanny pack?
This photo illustrates the differences perfectly.
Man On Left lives here, Man On Right...well, I don't even know what to say.
Brazil, perhaps.
Now, here, is an exemplary summer outfit on a local gentleman.
Cotton madras jacket, no socks, white-soled oxfords, crisp white shirt.
Stripes are always good.
I'm not saying there's anything wrong with dressing like a visitor, I'm just saying I can spot them.

Locals.
Each day I blast through small crowds of visitors with their maps (always maps!) and their backpacks and comfortable shoes.
Each day I marvel at how different they are from the locals.
Observe:

The unofficial uniform of the city. Great belt. Fabulous cuff bracelet. Comfortable yet chic shoes. (not shown)
vs.

A man in white shorts and running shoes. Also, they were holding hands. Unusual behavior here at 8:05am.

Summer art school students. In florals and bright colors. Clearly from out of town.

Shorts and white tee shirts? White tennis shoes? Not From Here.

A whole family in shorts and white tee shirts and SANDALS. Sandals are a very dangerous business in my city. One oughtn't wear sandals here.

Narrow, fitted short pants and sandals? AND a fanny pack?

This photo illustrates the differences perfectly.
Man On Left lives here, Man On Right...well, I don't even know what to say.
Brazil, perhaps.
Now, here, is an exemplary summer outfit on a local gentleman.

Cotton madras jacket, no socks, white-soled oxfords, crisp white shirt.

Stripes are always good.
I'm not saying there's anything wrong with dressing like a visitor, I'm just saying I can spot them.

Locals.
Comments
I love what your well-trained eye finds!
(p.s. I can comment! It has to be on Safari, though, Firefox just won't let me. Bastards.)
This is how everyone knew to ask us if we were lost.
Reminds me of a few summers ago we spent the night in the city where one of our out of town friends had a b-day party. we had coffee in starbucks across the street from the hotel and we played the "local or tourist game" - we used a lot of the same tricks you did :)
so funny.