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Short eeonyx fabric belt
First, I figured a small amount of fabric would work great.
Total resistance was 50 to 100kOhms, which was great to limit battery consumption.
Then, I found out that my voltage divider was measuring proper voltage, but the arduino was giving ADC readouts all over the place.
Turns out the impedance of my voltage divider was too high compared to the expected impedance for an arduino ADC (100k vs 10k)
But adding a capacitor, or two, fixes the problem since the capacitor loads up with the expected voltage and can hold it long enough for the arduino to sample it.