Chain Leggings were deliberately designed to not be able to be crafted by the player, although some mods, such as BattleTowers, do allow Chain Armor to be included as dungeon loot.
List of Armor Recipes Wiki Guide - Page 4 of 6
Item – Minecraft Wiki
Minecraft 1.20 Trails and Tales Patch Notes - Minecraft Guide - IGN
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Naga Scale Armor - The Twilight Forest Wiki
The whole chain armor set in one chest : r/Minecraft
Incendium - Stardust Labs Wiki
Chain Armour Crafted with Iron Bars : r/Minecraft
How to Summon an Armor Stand with Chain Armor - Wiki Guide
Every armor in Minecraft ⚒ Crafting recipes - GPORTAL Wiki
Leggings – Minecraft Wiki
Chestplate – Minecraft Wiki