same question about how often you should condition your leather jacket
how come some claim leather jacket that you wear and being exposed to the elements and salinity of our own sweat never need conditioning because museum piece that stay on a bust in controlled environment doesn't need conditioning.
The leather doesn't absorb anything, its saturated in waxes and oils and virtually impervious.
It's the lining that traps smells and dirt. I wash my jackets every decade or give the lining a sponge bath and dry in gentle sun.