Couching Feet
Basically, couching uses stitches to tack down a piece of thread, yarn, etc. to create a unique look and texture. The material being couched doesn't actually penetrate the fabric, but rather sits on top of it.
(Ref: www.janome.com › siteassets › blog › introduction-to-couching )
Bernina
43
- For cords, yarns, ribbons
and braids up to 2 mm wide. - All sorts of lines and shapes
can be couched precisely - For 5.5 mm and 9 mm machines
U.K Link: https://www.bernina.com/en-GB/Accessories-GB/Presser-Feet/Decorative-sewing/Free-motion-couching-foot-43
USA Link: https://www.bernina.com/en-US/Accessories-US/Presser-Feet/Decorative-sewing/Free-motion-couching-foot-43
Brother
F072

Elna
202-142-007
Add a decorative touch to your quilting and home decorating projects with this foot. It works like other free motion feet, but with the addition of small grooves that allow cording, yarn, or threads to pass underneath the presser foot. Two different feet are included to match your material’s thickness.
Global Link: https://new.elna.com/se/en/accessory/free-motion-couching-foot-202-142-007/

Husqvarna Viking
Foot "D" 412380445
With the Yarn Couching Feet Set you can easily create decorative yarn embellishment both when sewing free-motion and embroidering.
Two different feet will suit a variety of yarn. A detailed instruction is included with the product.
Global Link: http://www.husqvarnaviking.com/Accessories/Yarn-Couching-Feet-Set

Janome
202297008
The Embroidery Couching foot set comes with 2 different yarn weights, as well as a yarn guide arm that attaches to the extra spool pin hole on the top of the machine.
The PC-1 foot, for light size yarn; or PC-2 foot, for medium size yarn. The feet are also easy to thread, with an open toe and plate design.
U.K Link: https://j-shop.co.uk/products/embroidery-couching-foot-suitable-for-mc15000-mc14000-only?_pos=1&_sid=b7d149bce&_ss=r
USA Link: https://www.janome.com/accessories/sewing-machine-feet/embroidery-couching-foot/

Juki
#26
For free motion quilting together with cord sewing
Suitable for G, F, DX Series
U.K Link: http://jukiuk.com/shop/juki-sewing-machine-accessories/household-machine-feet/cording-embroidery-presser-foot-26/

Pfaff
#820607096
You can create beautiful trims when you use the Couching/Braiding Foot and your machine‘s decorative stitches to sew over yarn, cords, narrow satin ribbon, soutache braid, etc.
UK Link: http://www.pfaff.com/en-GB/Accessories/Couching-Braiding-Foot-for-IDT-System
USA Link: http://www.pfaff.com/en-US/Accessories/Couching-Braiding-Foot-for-IDT-System

Singer
250041496
Create unique surface embellishments. Fits the Featherweight C240.
Global Link: https://www.singer.com/Couching-Presser-Foot-IEF-System
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