Not sure about the 'split pants' but in San Fran, Cali I'd guess there's many reasons for wearing those:
Domestic Viruses ?
Millions of unvaccinated illegals...………….HELLo
BIRTH OF A VIRUS …
As I watched my neighbor put her dog’s poop in a single-use plastic baggy, I thought about split pants in China. When my wife and I got off the plane, 18 years ago, to adopt our first daughter, we …
regiehammblog.wordpress.com
Domestic Viruses ?
Liberalism Turns San Francisco into Slum, Homeless, Pooping in Streets
The once beautiful city of San Francisco is quickly turning into a third world slum. Liberal ideology has turned the city into a safe haven for illegal aliens, criminals fleeing prosecution, and homeless pooping in the streets, with dirty needles littered along the sidewalks.
rinoswamp.com
Millions of unvaccinated illegals...………….HELLo