Step 1) TRIM the BATTING even with the quilt top; TRIM the BACKING so it's at least 1-1/4" wider than the edge of the batting.
Step 2) FOLD the outside edge of the backing toward the trimmed edge of the batting, then FOLD the folded backing edge over the front of the quilt. PIN to secure, or work just a few inches at a time and hold with your finger. STITCH through all three layers. I like to use a serpentine stitch (mending stitch).
I don't use this technique very often - I prefer to apply a double-fold cross-grain or bias binding for better durability - but there are times when a self-binding fits the bill! And really, as long as it is done neatly, that's what counts (coming from the self-proclaimed "Binding Police" herself *Ü*).
We'll touch on this technique along with other "Alternate Endings" in my binding class ("In a Bind?") this week at the Small Town Quilt Show happening right here in my sweet little valley!
(click to see more details↓↓)
And if you happen to be in town... come learn my favorite trick to finish that last mitered seam to get a continuous, non-lumpy binding!