Hard Bargain is to sell stuff no less than you asked for, to refuse to give something if they offer you less money for what you are actually willing to get.
He drives a hard bargain, but we finally made a deal.
A: I would like to offer you $100 for your soccer tickets.
B: No.
A: $125?
B: No way.
A: $150?
B: Nope.
A: You drive a hard bargain. $175?
B: I will only accept $180.
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.