It seems so straightforward – lining up and stitching intersecting seamlines (or plaids or stripes) so that they match perfectly. Sometimes it's a very visible intersection, but, as even the most experienced sewers know, there are all sorts of variables to make it tricky: the pressure of the presser foot can throw things off, the slipperiness of the fabric, and sometimes things just shift. Susan Khalje has a couple of methods to help you out.

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