If you get the [Enchant Shoulder - Boon of the Scavenger] enchant, you can sometimes loot [Scavenged Cloth] from corpses, which contains 18-20 cloth.
Tailors will get 4-5 times as much cloth as non-Tailors, even if their Tailoring skill is 1. Don't expect much cloth if you farm without Tailoring. If you have a level 100 alt and you have a free profession slot, it's a good idea to learn Tailoring and go farm cloths with that character.

Shal'dorei Silk

Keep in mind! In Legion, several people can tag the same mob and still get loot. So, even if someone is already killing your mob, you can just help him and you can loot it too.
Most Legion mobs scale to your level, so these places are good for players between level 100 and 110.
HighmountainThere is a cave in Highmountain where you can find a bunch of Deepcavern Murloc at the end of the cave. There are always at least 6-7 up.

Highmountain - Snowblind MesaThere is a spot at Highmountain where Mightstone Flankers and Mightstone Slingers are fighting friendly NPCs and they respawn almost instantly after you kill them, so there are usually 4-7 mobs up. It's very possible that you will die a few times here if you pull too many of them. Try to get the last hits on low HP mobs, you can still loot them even if the NPC did the most damage to them.
Watch out for the ranged mobs, if you aggro them, they will keep shooting you even if they are hitting another NPC.
You might struggle here at 110 with ilvl below 830, but it really depends on your class.

AzsunaThere is a bunch of murlocs on the shore of this lake. Recommended for classes with good AoE.

Val'sharah - ShadowfenI recommend this place if you can only take down mobs one by one and you struggled at other places. You will farm Wormtalon Witches andWormtalon Huntresses.

Stormheim - Runeaxe Training GroundsRuneaxe Training Grounds in Stormheim was designed in a way that there is always a few Bonespeaker Runeaxe up. This means if you kill the last one, 2-3 new one will pop up. With ranged class, you could basically stand in the middle of the camp and just keep killing mobs.