Rather an unsophisticated method -- I made up a daub of mixed Milliput about the size of a quarter coin with a pinch of the stuff as a handle. Then press against existing portion of chain mail. Remove carefully to preserve the impressions. Let dry.
Then prepare fresh putty for use on your figure and use the now-hardened bit from before to make chain mail impressions.
There will likely be better suggestion from other Planeteers, but the above has worked before.
NR