You guys calling the original guy an idiot are all wrong. I'm a huge horse racing fan, and racehorses wear blinkers. A carriage-pulling horse, or a jumper, wears blinders, but the hoods that some racehorses wear are indeed blinkers, which is where the term comes from.
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.
We have a Zoom meeting in a few minutes and I’ll probably go pajama casual.