What is the meaning of "he must have had on some really nice pants"?
The interviewer:"what would you say if a man walked in here with no shirt, and I hired him?"
Chris Gardner: "He must have had on some really nice pants."
The line is taken from the movie called "The pursuit of happyness".

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Hi,

It means the man was probably wearing really nice pants since he got hired even though he was actually half-naked! I haven't watched the movie, but it seems the interviewer was somehow shocked by Chris Gardner's attitude or appearance and gave him a sort of sarcastic example. Hope this helps a bit, cheers!