Here are the things you will need:
- Scissors
- Thread and some yarn
- Thick sewing needle
- Meter
- Pins (optional chalk and ruler)
- Used hoodie
- Acrylic blanket or pieces of cloth
- Cushion filling or a pillow (45cmx45cm)
- A flap ( for closing the sleeves)
Source: http://www.handimania.com/diy/sweatshirt-pet-bed.html