Informal:
* A row of stitches
* A line of stitches
* A set of stitches
* A series of stitches
More poetic/descriptive:
* A tapestry of stitches (for a more complex piece of sewing)
* A web of stitches (for intricate or delicate stitching)
* A constellation of stitches (for a pattern of stitches)
Ultimately, the best choice depends on the specific situation and the desired effect.