This video gives a little detail on the differences of the most standard wires used - regular underwires and vertical underwires. After explaining the differences, I explain why I created the vertical flat. I'm still nailing down which size is most appropriate for me.
In traditional sizing, I am recommended to wear a 54 wire. In my testing, the 52 vertical flat fit well and barely moved on me, but once I was driving, I did feel it moving down a bit. I did not alter the bra pattern. I just switched out the wires, so its probably a combination of the pattern and possibly I need to try the 50 vertical flat.
I named these wires myself because I was the one that created them. I'm still hashing out the recommended bra sizes to wear these, so if you test them out, let me know what size worked for you (as well as what size is recommended for you in traditional charts).