You certainly should not "wash" a waxed cotton or canvas jacket anymore than you should wash your denim. Mild staining and such give a bit of character, but heavy stains such as grease or food can be spot cleaned with mild soap and warm water.
If the garment becomes odoriferous, putting it in the freezer overnight will kill the offending bacteria.
Boiled Linseed oil can be used to re-treat the jacket if required.
If the garment becomes odoriferous, putting it in the freezer overnight will kill the offending bacteria.
Boiled Linseed oil can be used to re-treat the jacket if required.