Up and down buttonhole is a variation of buttonhole stitch which is also known as Mirrored buttonhole stitch.
Up and Down Buttonhole is easily worked on all types of fabrics. The line this stitch forms is made up of a pair of stitches which are crossed with a tie at the base.
Up and down buttonhole is an incredibly versatile stitch. It is simple to work yet a little unusual. Do look at the directions as this is not two buttonhole stitches close together or with simple tied bar. The stitch can be worked in a square or long a line as illustrated below.
How to work Up and Down Buttonhole Stitch
Work this stitch from left to right. Each stitch of the pair is separate step.
Starting as you would with buttonhole work the first stitch of the pair as a regular buttonhole stitch with your needle pointing downwards wrap the thread under the needle and pull the needle through.
For the second part of the stitch, insert the needle and take a bite of the fabric so that the tip of the needle is pointing upwards as illustrated.
Wrap the working thread under the needle and pull the needle through the foundation fabric. As you pull the needle through pull the needle towards you instead of away from you. As you do this hold down the loop that forms with the left thumb to prevent it slipping. The loop forms as you stitch.
Note I have noticed online that some instructions create a loop then lace the working thread through the stitch. This is wrong the loop is created as you stitch and once you have the rhythm of the stitch it is easy and quick to do.
This loop forms the bar at the base of both stitches. This forms the first pair of tied stitches.
Work along the line. Once you have the rhythm of the stitch it is easy and quick to do.
As I have said Up and down buttonhole is an incredibly versatile stitch. Along a line the spines can change angle or length.
The stitch is easily worked in a circle with spines pointing inwards or outwards.
You can also work it along a curve.