scrubbed and V1rotate, i have been flying for over 16 yrs, and trained by some well known and respected pilots, namly a Jack and Brian, one of DC3 fame and another of Syd Airways, and in no way would i be considered a cowboy, or let myself be.
the only reason i have never worn bars is because i have never worked as a pilot! but i do own and fly my own aircraft, and currently building my own little twin. so the thongs and stubbies are simply the most comfortable to wear! and cheapest to buy.
i dont ever remember my instructors wearing bars or wings either while under instruction...