To the number of stitches indicated in your pattern, add 3 or 6 stitches depending on the borders.... 3 stitches (on the border side) if it is a vest....6 (3 stitches on each side) if it is a scarf.
You will get a better contrast if you "attach" your garter stitch to a fabric worked in garter stitch, moss stitch, seed stitch... textured stitches.
If you wish to use stockinette stitch, separate your garter stitch from the knit fabric with a row of purl stitches.
Note: the garter stitch is worked in stockinette stitch... 1 row RS, 1 row WS.
Step 1
Cast on a number of stitches and add 6 sts. (3 on each side).
Knit the first 3 stitches, continue according to the chosen pattern until the last 3 stitches. Slip the last 3 stitches one by one purlwise.
Step 2
Purl the first 3 stitches, continue according to the chosen pattern until the last 3 stitches. Slip the last 3 stitches one by one purlwise.
Repeat steps 1 and 2 until the desired length is reached.
If it is a vest, only add 3 sts. on 1 side.
Monique Kadowaki La Maillerie

