0.C stable.
Currently wearing on my legs:
Sheath (waist)
Drop leg pouches (strapped)
Knee pads (strapped)
Duster (outer)
Leather chaps (outer)
All items have encumbrance 0 and fit me perfectly.
All items except the duster layer easily.
According to the in-game help, I should incur an encumbrance penalty for having more than one layer with an extra item.
What am I missing?