German work aprons--Anyone have one, or know the colour?

[Fritz die Spinne]

Among my favourite photos, everyday chores, work, tasks, and the like always intrigue me. I have wondered about the nature of the aprons. Are they black, dark grey, or even blue? Was anything akin to Denim possibly used, or is that essentially very American?

I would also gather that a Schuster would likely wear a leather apron, or that a Fleischer could even have a rubberised apron? 

I do some living history, and would like to be able to properly sport an apron if I am cleaning boots or my rifle in public. Thank you!