He didn't invent the look per wikipedia

Akeman, known by this time only as Stringbean, was one of the Opry's top stars throughout the 1950s. During this period, he adopted a stage costume that comically accentuated his height, consisting of a shirt with an exceptionally long waist and tail, tucked into a pair of short blue jeans (from Little Jimmy Dickens) belted around his knees. The costume made him look like a very tall man with very short legs and helped contribute to the illusion of Akeman towering over his fellow performers. This kind of costume had many antecedents, including Slim Miller, a onetime stage comedian who was said to be Akeman's direct inspiration. The costume became synonymous with the Stringbean persona known to his audience.

Enjoyed the banjo playing though... very good. Thanks for bringing him to my attention.