Fold the fabric and keep the pattern template in such a way that the straight shorter edge of the template is on the fold as shown above. Mark the pattern on the fabric and cut it out. You will get one piece of your collar.
Repeat the steps on the other fabric piece and the interfacing. You will get three pieces like the above.
The interfacing should be smaller than the pocket pieces so as to avoid the bulk at the seam.
Take the interfacing and cut 3/8-inch around the entire edge as marked above.
Now fuse the interfacing onto the wrong side of one of the collar pieces, following the manufacturers instructions. Make sure to leave a uniform gap all around.
Take the other collar piece and attach satin ribbons about 10 inches long on both its curved edges as shown above.
Take the two collar pieces and layer them with the right sides together, aligning the edges and pin, take care to tuck in the satin ribbon.* Note that the 2-inches marked is to be left open to turn the collar right side out.
Sew them together with a 3/8-inch seam, removing the pin as you go.
Clip the corners and trim the edges (not shown in the picture).Turn it right side out through the opening.
Press it taut and top stitch along its entire edge, tucking in the raw edges.
Your two-sided, detachable collar is ready! Wear it around your little girl’s neck and tie the ribbons together!