After receiving several requests in our suggestion box (buzon@guiaswow.com), we have decided to make this guide for all those adventurers who are desperate to obtain the elusive (and expensive) Embersilk Cloth.
According to our investigations, and after obtaining classified information and bribing a few members of the CSI, we have managed to decipher some confidential reports, finding that there are 4 areas suitable for intensive farming of this precious material. 3 of them are in Twilight Highlands and the last one is in Deepholm. Before explaining each area, comment that these have been verified by the GuíasWoW, and although they are not the only areas that exist, they are the most common.
Let us begin.
Elementium Depths in Twilight Highlands: This area is located to the southwest. It is a cave riddled with Twilight Miners and Overhangs of the Deep. Both enemies have a 45% chance to drop the precious cloth (drop). Keep in mind that this mine is part of a mission in the area, but fortunately there are many of them. There are also a number of neutral monsters, which will only attack us if we attack them, so… Not Areas !! Unless you want the whole mine to attack you 
Tripal Pit in Twilight Highlands: This area is located in the northwest just west of Bramal. Here we can find Gut Ogres, who have a 50% chance of dropping 1 to 3 Embersilk Cloth. There are quite a few ogres in the area and they also reappear in a minute. It is a mission area for both the horde and the alliance, so it depends on the server it will be more or less easy to farm there. We must be careful with the Tripal ogre patrols, they usually consist of 5 or more members and we can have serious problems if they see us. The best option is to go inside one of the houses and wait for them to reappear, but beware some of the houses have 2 floors, if they discover us, we will be attacked by several of them.
Nagas Zone North of Dragonmaw Harbor: This is the last area of Twilight Highlands. It is located to the east in the middle of the map approximately. It's a fairly easy area to farm… If you're playing on a PvP server and you're from the Alliance, you might run into some heavy resistance. The Nagas leave the sea and head to the beach constantly, so it will be enough to get to a good point and wait. The probability is approximately 40% and in addition to dropping embers silk cloth, among other objects, they will also provide us with blood prawns, which are currently quite a precious object on some servers.
We change areas.
Deepholm: Verlok Village: Located in the Northeast of the map, just north of the Crimson Extension. In this area we will find about 100 troggs that can be eliminated quite quickly and that also have a very fast respawn. In fact you will be lucky if you have been able to kill about 10 when several have already reappeared, or other troggs have seen you. These troggs also drop green objects quite frequently.
There is a way to dramatically increase your drop of this and other materials, there is a potion, Potion of Treasure Hunt that will make your life easier. According to our tests in Deepholm, killing 10 troggs without the potion 2 cloths while with the potion we will find 2 cloths and a Tiny Treasure Chest. Inside the chest were 10 more cloths, that is a total of 12 cloths for 10 troggs.
We hope it will help you and that you get a lot of money ... or knit great garments. We await your comments so that we can share more areas and tricks with everyone.
Note: Recently, a live change was made to the server, which allows tailors to get 50% more cloths.