In the middle of the last century, when people still wore clothes to fit the time of day and the occasion, Highland attire was divided into six categories:

(1) Formal Day Dress (as worn to levees at Buckingham or Holyrood Palace); (2) Morning Dress (as might be worn to a garden party at Holyrood Palace, or to a formal wedding in Scotland-- the sporran would be silver mounted fur, seal skin, or leather and worn with a silver sporran chain ); (3) Day Dress (which would be the equivalent of a business suit-- the sporran would be leather, fur, or hide, silver or brass mounted, and worn with a silver [or brass] sporran chain); (4) Hunting Dress (this was the Highland version of the outdoor tweed suit-- heavy tweed jacket, a heavier weight kilt, plain leather sporran with leather sporran strap, etc.-- in other words a very plain form of dress); (5) Informal Evening Dress (good old black tie, also called semi-formal in the USA-- a silver mounted fur or seal skin sporran with silver chain); and (6) Formal Evening Attire (white tie-- the choice of sporrans was the same as for informal evening attire with the addition of a silver mounted hair sporran if so desired).

So, any plain leather sporran is a "hunting sporran".