Indiana Jones is a fake character though. The real story is that Harrison Ford worked as a carpenter before he made the big time as an actor, and swore by Alden 405's while working all day in the shop.
When he got cast as Indiana Jones, the costume designer was trying different boots for him but he insisted on wearing his trusty Aldens. The studio then went to a shoe store in Burbank and bought several paris in Harrison Ford's size to use in the film. Some were aged and dirtied for different scenes, etc.