Number 4
Issue: Another coat, this one has a drawstring thingy at the waist which gives some shape, had pulled one end out of the drawstring and was like wearing a big square blob.
Fix: Lots of turning inside and out, pulling the adjuster things and feeling for the cord/cords.
Discovered that there is only one cord, which is stitched into a seam somewhere one end and then comes through 2 eyelets inside with an adjuster thingy. So all that had happened to mine was the cord had frayed and come out of the seam and the eyelet. In the end I had to unpick a bit of the interior casing, thread the cord back through the adjuster and the eyelet and then handstitched to secure the end and backstitched up the casing I had unpicked.
Not super pretty but it does now work and the shaping is back in the coat.