cfmdesigns

I found that very very precise cutting and seaming (to the single thread in the weave) invariably gave me smaller blocks than "advertised." Why? Because sewn fabric is not really flat. You have a third dimension: the height of the seam with its sewn threads. I either cut bigger, seam smaller, or content myself with the slightly off-size finished block. The link Paper Princess provided is a good explanation. I would be a little nervous about blocking stitched, woven cotton. I've blocked knitted and crocheted cotton and wool, but I always thought the flexibility of the stitches played a part in that process. Hmmm.