Albeit an older definition, a staffer is a person who works for a company, group, organization, etc. So basically an older way of calling yourself an employee.
Random guy: What do you do in life?
Random guy 2: I'm a proud staffer at Sega! I get to make Sonic games!
Random guy: Wow! Congratulations!
Random guy 2: Thanks!
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.