Step 2: STAGE 1: Dismantling Coat
Start by taking apart the coat with your stitch-ripper. Remove the following parts of the coat:
3. elastic sleeve cuffs
4. elastic waistband
You can set aside the hood and the sleeves, as you won't need them. The elastic sleeve cuffs will be used as sleeves for the jacket, and the elastic waistband will be used as the waistband and collar for the jacket.
Leave the zipper in place, as this will be an integral part of the coat. No need to take apart a zipper when it's already sewn in place!