Actually, I use it to level from 42 to 51. The trick is to obtain the cotton threads cheap.
Farm a LOT of lightning clusters in Qufim or Carpenter's Landing, desynth robes until you drown in grass threads and cotton threads (used grass threads to skill up to 42). You should get 5-7 grass threads or 5-6 cotton threads on a successfull desynth.
Please change the data on the main clothcrafting page. I wasted about 5-10k on this because i tried to make it with cotton thread at level 38. I figured it would be a good recipie to level with. Then i fail 9 times in a row, not loosing TOO many materials, and im realize this is not right. I check the site, and it seems that Allakhazam had the wrong info, before, so make sure you dont make this mistake.