The levels of items and materials have been largely revamped. Velveteen is mid 20s, Linen is mid 30s. At 37 you should be looking at wool and felt (I'm not that high so I don't have the exact level values, do some experimentation). Also, instead of trying to grind, make finished items, they're much simpler to create and easier to control exactly what level of experience/synth difficulty you're after. You can also dye them for a double dose of exp and to create a very desirable item to sell at market to recoup your funds. In other words, its far more entertaining to PLAY a crafter, rather than grinding. Try it out!