Its a pretty common phrase, the person that "wears the pants" in a relationship is the one that does the decision making. Its usually used to describe women ("She definitely wears the pants in THAT relationship") because it goes against the norm of men being the breadwinners/boss/decision-maker of the relationship.
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The dads joke was to make the woman try on his pants, which would obviously not fit, and then put to rest any idea that she might be the "pants wearer" of the couple.
I don't understand the father's advice though?
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The dads joke was to make the woman try on his pants, which would obviously not fit, and then put to rest any idea that she might be the "pants wearer" of the couple.