How do I attach a single (resistive) sensor to a plain V3 through the 1033 pad?

Hi. On a garment wearable, I’d like to attach a DIY sensor (a soft pom-pom that acts as a potentiometer) to the V3 and use it for effects. Could I get details of best practices for connecting to the 1033 pad directly so that I could read this sensor with analogRead()? I would like to stay small and simple for many reasons on this project, and not use a sensor board, just the V3.