Work a k1-fbf when a flared increase is desired. This increases 1 stitch to 3 stitches (an increase of 2 stitches).
To work the k1-fbf (knit into front, back, front)
First knit into the stitch on the left needle and without removing the original stitch from left needle, twist the right needle and knit into the back leg of stitch, still not removing the original stitch, then twist the right needle again to knit into the front of stitch. With 3 new stitches on the right needle, remove the original stitch from the left needle.
Note: When working this type of increase a small purl bump will appear at the base of the stitch knit into the back leg; this cannot be avoided.
To work the k1-bfb (knit into back, front, back)
Knit into back leg of stitch, then without removing stitch from left needle, knit into front of stitch, then into back of stitch and remove from left needle. Increases to 3 stitches from 1 stitch