How to make adjustments to a PVC raincoat? I have a raincoat made of PVC that I’d like to make some adjustments to: adding more buttons or other ways of attachment (it is full-length but it has buttons only to the knee); adding a string at the bottom (to prevent too much pressure on the last button); and perhaps a pocket. 

The problem is that I’m not sure how to treat the material: The acetone from the general glue for rubber would most likely melt it (I've tried it on a similar, if not the same, material before) and if I sew it the PVC would tear easily. The original adjustments seem to be made through some kind of heat-and-pressure process that cannot be duplicated without the proper machine.



The solution I came up with was to sew a small patch of cloth on the inside area I want to treat and then treat it like a cloth, but that seems a bit heavy-handed. Does anyone have a better idea?
I'd recommend you head to a camping supply store
 (like REI or Academy ) and pick up some tent repair tape.
 Its usually rip-stop nylon with adhesive on the back.
It will reinforce the pvc so you can add buttons etc.