I think I now know why Mexicans often wear brown or tan shoes, especially in the country or every day. And it is not just because brown or tan shoes compliment their lovely brown skin, which they do.
It is because they walk, a lot, and the ground is dusty but not gray/black dusty like back home. The earth here is an iron rich reddish brown.
When you go for a walk on a country road with your black sandals, they turn reddish brown too, as do your feet and ankles.
Time to take these pies to the shower.