I've got to make about a dozen rectangular seat and back cushions from a plain twill fabric that I was planning to wash before I cut. However, I think, to save the customer money I've planned out the pattern too tightly to risk cutting it in 3-yard lengths. I've tested the fabric and know how much it shrinks and stretches. I could cut the required pieces the requisite larger size, serge them and then wash/dry BEFORE sewing (meaning I'd have long bands swishing around getting caught in my machine) OR make them up completely (made appropriately larger) and then wash them.
Any thoughts? The other thing I could do is identify where I could safely cut, instead of just go for 3-yard cuts.