Like you, I have little flesh on my back so would need to place my patch pump below my waist.
However, I have always been nervous about taking my "tight pants" (I frequently wear leggings) off to use the loo. By wearing my pump on my front, I get the visual reminder as I pull them down.
How do you find the risk of catching your pump when it is on your back?
(I am looking for alternatives to my lower abdomen but arms are out of the question as most clothing assume I have twigs for arms rather than muscles so there is no room for anything apart from an arm in the sleeves. )