Read on to learn more about the process:
I started with an extra long cardigan sweater I’ve had for quite a while. I chose it because a) it was big – lots of material to work with and b) I wasn’t too concerned about ruining it. The first thing I did was remove the sleeves.
Next, I added ribbon to serve as a facing.
I attached the ribbon with a serger to finish off the raw edge. The ribbon was pressed to the inside of the arm opening along with the 1/2 inch of sleeve I left. I used the seam where the sleeve had been attached as a guide.
I sewed around the arm opening with cordonnet thread using an extra long stitch length. (4mm)
Later, the ribbon was whip-stitched in place.
I wanted the overall piece to be smaller, so I removed the extra length. I saved it to use for the collar later.
I also trimmed the existing collar/trim to 3/8 inch.
Wanting a softer look, I rounded the front corners using a plate as a guide.
After measuring the length needed to make the continuous collar, I had to do some math. I discovered that the extra length I had removed was not going to be enough the construct the collar. I needed to use the sleeves as well.
I cut the extra length into two 5 1/2 inch strips, then I pieced them together along with the strips cut from the sleeves to get a length long enough for the collar. After that, I pressed the entire length in half to make it 2 3/4 inches wide. The raw edges were then serged together to make a long tube.
I pinned the collar around the vest. I had to piece it together at the bottom of the back and at the center neck. I did this the same way I would a quilt binding.
Finally, the entire collar was stitched to the vest using a narrow zig-zag stitch.
I pressed the seams open and gently stretched the collar to curve around the rounded corners while it was warm. I also added a hook and eye closure in the front.