Let's say you do the turn-ins at the level they turn available:

12 for Wool. XP To level at 12 is 9800, 13 is 11,000 you are looking at getting 1.55 levels for all 5 turn-ins. Or if you did right at level 12, you will be a bit over 13.5 once turned in.

26 for Silk will get you over 3 levels. (total Xp for 26 thru 28 is 96,600) and will get you about 1/3 into 29.

40 for Mageweave will get you 95% to 41.

50 for Runecloth will get you 25% into 51.

Total levels you can gain from cloth turn-ins (under RAF) is just over 6 levels if you do each turn in as soon as they come open to you.