- Go Tailoring (obviously)
- Get 25 Tailoring Skill
- Ride around the world picking up the free +3 tailoring treasures.
- Get a few first-craft bonuses
- Max out the 4th specialization that gives you 55% additional cloth drop chance
- Go to humanoid-heavy follower dungeon (Priory or Darkcleft both seem alright)
- Clear first few rooms in one big AoE pull
- Loot 20 bolts and 80 cloth
- Reset dungeon
Conversely you can join one of those huge Looking-For-Group 2x4 cloth farms. I joined one for a bit and it was also fine. Plus you get more greens to AH (or sell to those pesky enchanters). But for a completely solo cloth farm, the above has been my best strategy so far.