My best advice is to take advantage of the 200% bonus on turn ins for levequests and ride the level 15 and 20 quests for large experience amounts to skip velveteen as much as possible. I haven't checked on prices for flax for linen products yet (the 30s), but those aren't easy to skip cause the experience from the lower levels starts to not be enough to get a level in a reasonable amount of time, velveteen items are expensive, and flax is from gathering only so you can't just farm mobs for it.
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