Yep its all reflective tape, I have a ten foot by six inch roll I got off ebay for $9. Even when not under a flash it looks great, as depending on the angle it either reflects light and "glows" or just has a nice rich blue to it.
The lower part is 1 inch thick, it widens to an inch and a half as it goes up. The slanting part is smaller, probably 3/4 or so of an inch. Not sure exactly. For the circles I traced around a 5/8' metal washer, it is an inch and a half in total diameter.
While I was at work I nabbed the top to a plastic container(I manage the books for a grocery store. It curves up and has a good amount of plastic to plastic contact with the other piece of plastic. I will then glue that to the jacket. I am using some magnets to attach the disk.
Got the boot toppers done, and I am going to try another thrift store run, looking for a belt, and some gloves.