Pro-tipsauce - Go into the (o)rders menu and set the loom to auto-loom dyed thread only. Then have your laziest dorf dye it up
As for disposal of cloth, Set custom cloth only stockpiles, custom crappy clothing stockpiles, and some clothesmakers workshops near your entrance/trade depot. Mass decorate everything and trade away.
So, to make sure I understand: Go to the (o)rders menu, set the loom to only loom dyed Thread, assign the Mayor to do all the work, and go build a Custom Stockpile?
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You want to lay down a cloth stock pile (use the (t)ake command to stock it)and disable thread. Set down a finished goods. Disable everything but clothing Disable all material except for cloth and leather. Enable armor, disable all materials except for cloth and leather. Disable shields. Use the (t)ake command to move prestored clothing to it. Plop a few clothemakers shops down and put sew image on repeat. If you want to use up the stock quickly you'll want specialized processors, miller, dyers, weavers, clothiers, and haulers.(You'll want to assembly line it)
Also, like the others said, bags are always a great choice. Can never have too many bags for flour and sand. Have custom stockpiles for your pots, bags, barrels etc. so you know your stock and have enough haulers to keep everything in its place.