I have the PV-500L3 button camera. I've altered two polo style shirts where the bottom button replaced by the button camera. Its very hot in south Texas and wearing a coat or some additional piece of clothing is not an option and would also draw attention to myself. The shirt, due to the heat, is already a lightweight fabric.
I've found that sometimes the video has a slight upward angle even when standing upright. I do not have any belly that would angle the camera that way and have come to the conclusion that the weight of the camera is just enough to angle the fabric its attached to.
Does anyone have any suggestions on a different way to wear the camera. Perhaps on a different shirt. I'm planning on testing out a strip of medium weight iron-on fusible interfacing to add some structure to that part of the shirt. That's the only option I can think of.