The Farmer Mog - Cloth

"There are only three things that can kill a farmer: lightning, rolling over in a tractor, and old age." - Bill Bryson

Items used in this Transmog & Source:

Weather-Beater Fishing Hat (yes, clothies you CAN mog this) - Fishing

Resilient Mantle - Level 30ish world drop

Blue Overalls - Tailoring

Green Lumberjack Shirt - Tailoring

Pagan Mitts - Level 20ish world drop

Consortium Sash - Level 70ish Outland world drop

Foreman Pants - Drop from Gibblewilt in Dun Morogh

Willow Boots - Level 15ish world drop

Staff of Justified Sins (warlock only) - Quest reward from A Boon for the Powerful (Alliance)
Staff of the Left Hand Path (warlock only) - Quest reward from Token of Power (Horde)

See this transmog on other race models: WoWhead item comparison of this transmog

This Set with different Lumberjack Shirts & Alternate Boots (from left to right):

Yellow Lumberjack Shirt - Tailoring

Blue Lumberjack Shirt - Tailoring

Red Lumberjack Shirt - Tailoring

Wolf Fur Boots - Quest reward from Protect the Frontier (Alliance only)

Slippers of the Crescent Moon - Quest reward from Mistmantle's Revenge (Alliance only)

It seems only fitting that with the coming of Mists of Pandaria and The Tillers, that we have have a few farmer transmogs ready! ;)