The boot armor that I made is actually a cheat. On the stock photo of Elrond, I couldn’t tell if the armor was actually overlapped bands with silver edgings. For my purpose, I decided to just use a flat piece of vinyl, backed with heat-curved foam, and accented with silver polymer clay crisscrossed stripes. Then I used loops (same system as the back of the vest), to wrap the “armor” (more like a shield) onto the boot.
So that’s what I did.
I punched holes where I would attach the loops for the back laces, brushed on some Mod Podge, and attached Velcro to the bottom tabs to anchor the armor to the sole of the boot. Easy as pie.