The Stormwind Guard look is a famous one! I never really liked the Imperial plate set myself but after i saw Dawn Moore's remix on the look liked it so much i decided to try and put together a Stormwind guard set for clothies aswell!
Head: Cowl of Winged Fear (fits better with Stormwind Tabard imho)
Shoulders: Rebirth Spaulders
Chest: Blue Linen Vest (It won't show anyway so i guess any sleeveless chest would do)
Hands: Gloves of Unfailing Faith
Legs: Whitemend Pants
Feet: Boots of the Long Road
Waist: Vestal's Irrepressible Girdle
One hand weapon: Azuresong Mageblade
Off hand weapon: Grand Marshal's Tome of Power
Tabard: Knight's Colors / Stormwind Tabard