2 mailles endroit dans chaque maile

A nice piece of medieval sewing terminology!

In maille (also spelled mail or mailles), a "maile" refers to a single ring or link of the chainmail armor. And "endroit" is a term used to describe the front or outer side of a maile.

So, "2 mailles endroit dans chaque maile" translates to "2 rings on the outer side in each maile".

In other words, each maile (ring) has two rings on its outer side, which are connected to form a chainmail pattern. This is a common construction method for chainmail armor, where each ring is linked to its neighboring rings to create a protective mesh.