Four things that decide whether a wallet works
The lace panel is the front face rather than a decoration laid on one. That changes what the wallet does at the edges, in a pocket, and after a year of use.
The panel carries the face
Because the lace spans the front, there is no stiffener behind it to prop the wallet up — it holds its shape without the bulge.
It keeps to one thickness
Cards are held at the sides rather than stacked into the fold, so the spine stays put instead of swelling as it breaks in.
The wear points are reinforced
Stitching follows the card-slot edges and the fold — the two places a wallet gives out first.
The fold is set by hand
The hinge is shaped while the leather is still pliable, so the wallet opens flat from the first week rather than after months of use.