The first thing you may notice about someone wearing a pump is how often they readjust it. I am always readjusting it to how i sit and if i want to run. constantly pulling my shirt up or down to uncover it or tuck in the tube. It always manages to sneak out! With the smallest bit of discomfort Or wiggly-ness I am stuffing it in a pocket or clipping it some  how else.
It sounds annoying eh? But It has become such a habit. Just a normal part of daily life! that I don’t even notice I am doing it anymore.
Tube tucking is the most often one! Next time look closely and see if you can catch me doing it.