Tailoring allows players to cut and weave various pieces of cloth into armor, bags, shirts, and other cloth items. Tailors play an especially important role in guilds because they can create bags for the entire guild provided the guild members gather the proper ingredients. Tailors are responsible for creating cloth items for cloth wearing classes: Mages, Warlocks, and Priests. They may also occasionally make items for other classes interested in wearing cloth, if the items are especially appealing.

Bags

Tailors are the main creators of bags. Players can acquire bags from loot drops, quests, or merchants. However, tailors can provide bags in larger quantities, while also offering cheaper prices than trade merchants. Every class needs and wants bags, so this provides excellent opportunities for tailors and also makes them extremely popular, especially to players looking for 6 and 8-slot bags. As tailors increase their level, they can more easily find or purchase ingredients for bag making

Special Clothes

Tailors can also create special outfits such as dresses or formal attire. These can impress other people in town or be used for special occasions.

Shirts

Tailors can create a wide array of different shirts. In addition to being available in different colors, shirts also come in many varying styles. Shirts can sometimes show prominently on a character, depending on what equipment they are wearing. A shirt has the potential to make a character look much better! Tailors can sell shirts to players looking to improve their appearance.

Recipe Ingredients

Tailoring does not require a gathering skill. Proper ingredients must be gathered from monsters or purchased from other players. If your friends know you're a tailor they also may collect tailoring ingredients for you, provided you let them know exactly what you need.
The main staple for tailors is linen, followed by wool, silk, and mageweave. Typically humanoid monsters drop these items. You can ask around to find out what specific monsters drop them. Recipes usually require thread or possibly colored dye which is purchased from trade merchants. You might also need leather, gems, potions, and other special ingredients created by other Profession craftsmen. Leather is found by Skinners so you will likely have to purchase it from another player or from a friend. Gems are found from monster drops, treasure chests, mining, fishing, and Rogue pick pocketing. Potions will need to be purchased or given by an Alchemist.

Tailoring

Tailors do not require any special equipment to create their items, such as blacksmiths require anvils. Tailors can create items wherever they want, as long as they have the proper required ingredients.

Other Information

Cloth Types are, in order of power: Linen, Wool, Cloth Silk, Mageweave, Runecloth.
Artisan Tailoring is available at the highest level.
Skinning might go well with tailoring, because you can collect leather for recipes.
Additional Tailoring recipes can be found in encoded messages found on the members of the Twilight's Hammer in Silithus.