the.com/bigwig

Someone important, named after the wig that once did the flexing for them.

means An important or influential person, especially one who acts self-important about it.

from From the 18th century, when large, elaborate wigs were worn by judges, nobles, and other men of rank and consequence — the bigger the wig, the bigger the status it announced. 'Bigwig' started as a literal description of these powdered status symbols and drifted into sarcasm, becoming a label for the self-important person underneath, long after the actual wigs fell out of fashion.

origin
17th century judges and nobles wore huge powdered wigs
logic
bigger wig literally meant higher rank
irony
the person could be forgettable, the wig was not
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