Okay, so it's not so easy to truly show you what mail looks like via an illustration, but let's give it a try. See the knight to our left? See the armor covering his arms and legs, neck and head? Now picture those little lines and squiggles and boxes as "a flexible armor made of small, overlapping metal rings". He's got mail! (Sorry, I couldn't resist.)
The knight on the right is wearing plate armor.
See the difference?
(Plate armor began evolving towards the end of the 13th Century. Mail armor was used in the 12th Century, the time setting of my novels.)
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