Watch This Great Mattress Stitch Tutorial From Moogley
The mattress stitch is the most invisible of seams. It is a great stitch to use when you need to sew to crocheted pieces together.
The key to making an invisible seam, is to mirror what you do on one side with what you do on the other. If you are joining a longer section together, it is a good idea to use stitch markers.
Moogley has made a great video tutorial which you can see below. They also have an informative photo tutorial on their blog. You can find it here: Photo Tutorial
Watch this great video from Moogley. It shows you how to do this great “invisible” stitch.