Double Increase technique: (K1 P1 K1) in next stitch
This is a knitting technique that puts three stitches onto the new needle where there was only one stitch on the old needle. This is known as a double increase.
This is one of several methods of doing a double increase.
(K1. P1. K1) in next st.
This instruction is telling you to do three different things all in the next stitch – which means that you do not remove the stitch from the old needle (usually the left-hand needle) until after all three things are done.
This series of photos walks you through it step by step.
(K1. P1. K1) in next st: First Step
The first step, as shown in this photo, is to knit into the next stitch but leave that stitch on the holding needle. DO NOT drop the stitch from the old needle.
Note: the holding needle, or old needle, is the left needle in these photos. The working needle, or new needle, is the right needle.
(K1. P1. K1) in next st: Second Step
Put the yarn to the front between the points of the needles in preparation for the next purl stitch.
Now, PURL into that same stitch that is still on the holding needle but again leave that stitch on the holding needle. DO NOT drop the stitch from the holding needle.
(K1. P1. K1) in next st: Third Step
Put the yarn to the back in preparation for the next knit stitch – again moving the yarn between the points of the needles.
Now, KNIT into that same stitch that is still on the holding needle.
And finally drop the stitch from the holding needle.
(K1. P1. K1) in next st: Completed
The K1P1K1-in-next-stitch is done.
In the photo, you can see that there are three stitches on the working needle (the right hand needle) coming out of one stitch from the previous row.
This sequence is a double increase.
This little snippet of knitting instructions feels sort of like doing K1P1 ribbing. It might take a bit of time to get comfortable with switching the yarn between the front and the back so often.
But it is an easy way to get a double increase in knitting.