Shirtain is when your wife hangs up all the wetshirts from the washer to air dry on a overhead door ledge.
Dammit !!! Every time i walk through the shirtain half of the shirts fall off and i need to pick them up. I wish she would just get a clothes line outside.
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.