Since I have already posted everything I have on the Lunar Festival dresses, I had to figure out something different. So I picked this screenshot of my rogue - fortunately I still had it for she is now a gnome, and it does look a bit better on a tall character.
This began when I got interested in fishing, and wanted to put together the best outfit for it.
Hat: [Weather-Beaten Fishing Hat] is excellent for this outfit; the colour matches exactly (well nearly). It can be found in [Bag of Fishing Treasures] (Outland), [Bag of Fishing Treasures] (Northrend) and [Bag of Shiny Things] (Stormwind), which are rewards from the fishing quests around the world. If you find yourself unlucky with those bags, you can try for [Lucky Fishing Hat], which is a reward from Rare Fish - Keefer's Angelfish.
Shirt: [White Linen Shirt] made by a tailor. This outfit can be used without it as well, on a warm day.
Overall: [Blue Overalls] is made by a tailor. Excellent for fishing. An alternative could be the - admittedly prettier - [Mechbuilder's Overalls], but this item is a random drop from mobs in Gnomeregan, and requires you to have engineering as a profession.
Belt: [Azure Silk Belt] can also be made by a tailor. It may not be the best belt for this outfit, but I personally picked it because it has a swim speed increase; at the time I was trying for the [Arcanite Fishing Pole] and such things were important.
Gloves: [Woodworking Gloves] drops from Goblin Woodcarvers in Deadmines.
Shoes: [Nat Pagle's Extreme Anglin' Boots] is a reward from the quest Rare Fish - Brownell's Blue Striped Racer. The Brownell's Blue Striped Racer is a fish that can only be caught during the Stranglethorn Fishing Extravaganza, on Sundays.
The knife is a [Razor Sharp Fillet Knife], also found in Bag of Fishing Treasures, and the fish is likely a 17, 19, 22, 26 or [32 Pound Catfish]. There are plenty of offhand fishes in the game, so you just have to pick. Or, well I suppose it depends on what you get.