Craftsman Wilhelm at Light's Hope Chapel in the Eastern Plaguelands wants 8 Frozen Runes, 16 Enchanted Leathers, 5 Essences of Water, 5 Cured Rugged Hides and 300 gold. You must also be of Exalted reputation with the Argent Dawn.
Thanks to you and Omarion, may he rest in peace, I am now able to create a Polar tunic. All you need to do is bring me the materials and pay a small crafting fee.
