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-armor wearing classes: Mages, Warlocks, and Priests. They may also occasionally make items for other classes; cloaks for example. Tailors are also able to make special cloth equipment which requires that the user have a high level tailoring skill in order to use the item.
More information can be found on WoWWiki.[[1]]