I can understand the idea of sticking with tradition.
And I can understand the point of the original wigs - you don’t want to fuss with your hair all the time, so it’s the easy way to keep an elaborate hairstyle.
Eighteenth-century fashions for men’s wigs came in every conceivable variety and often reflected the common trend for new fashions to react self-consciously against old ones. Too-small wigs were just the flipside of too-big ones.
Any style could have become associated with barristers. It just happened that it was this particular mid-century fashion.
I can understand the idea of sticking with tradition.
And I can understand the point of the original wigs - you don’t want to fuss with your hair all the time, so it’s the easy way to keep an elaborate hairstyle.
But why don’t they cover all the natural hair?
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They are symbolic and traditional rather than in any way functional. You could as easily ask why they cover any natural hair, as why they don’t cover it all.