i actually sewed right next to each seam ..before.. seam ripping the zippers out (and sewed two stitch lines and cut between my stitches to remove the hood. Then I folded each edge over on the hood and sewed it).
Sewing first eliminated loss of the down.
Then after seam ripping, I sewed the edges where the zippers were again.
For example, see in my pic above with the seam ripper...just above my finger tip, you can see the black fabric, the zipper sits between this and a layer of blue fabric. I sewed these back together after zipper removal.
so.....yes, there was definitely sewing involved.