Cloth that has already lived a life as a garment does not lie on the cutting mat the way cloth off the bolt does. Where new yardage sits flat and obedient under the ruler, a piece rescued from an old shirt or dress tends to shift and creep as the rotary blade passes, and the edge you cut is not quite the edge you meant. Understanding why reclaimed cloth behaves like this, and how to settle it before you cut, is what keeps a quilt built from it as accurate as one built from new.
The difference comes down to the finish. New fabric leaves the mill with a light dressing worked into it that holds the weave steady and square. A garment loses that dressing over its lifetime. Wearing softens it, repeated washing rinses it away, and every seam that was stitched and later unpicked works the threads loose a little more. What returns to your hands is cloth whose weave has nothing holding it in place, so the grain slides under the slightest pull. Linen shows this soonest because its weave is open to start with, but every reclaimed cotton carries some measure of the same looseness, even when it still feels firm to the touch.
The remedy is to put a fresh finish back before the blade ever touches it. Starch the piece, press it flat, and only then cut. In that order the fabric is held still long enough to be cut square and carried through piecing without stretching along the way. Skip it and the movement does not declare itself at once. A softened piece can shift a thread or two as you cut, and a little more as you feed it under the foot, and none of it looks like trouble in the moment.
That is the real reason the step cannot wait. The shifting surfaces several units downstream, when points stop meeting and seams no longer fall where the pattern says they should, and by then the piece that moved is too far back in the work to single out. You are left correcting a symptom whose cause is long gone. Starching before you cut removes the problem at the only point where you can still see it clearly, which is before it has had the chance to travel.
How do you prepare reclaimed cloth before it meets the blade, and has a shifting piece ever sent you back through a block hunting for the culprit? I would love to hear your experience in the comments.
