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For extra authenticity make kumihimo cord out of silk to tie it together. :)
Much like the booby armor you see in fan costuming is a really stupid idea. Real Breastplates came to a point in front to direct the force of blows away from what you wanted to protect.
I think from a physics point of view that you would want the plates overlapping from the top like shingles to direct the sword force AWAY from the person. As it is, the sword edge could catch on the plates and go in toward the paracord.