What you will need:
1. Fancy dress (and any extra material or thread you may need for sewing)
2. Industrial foam
4. Mould release agent
5. Dowels (wooden or plastic)
7. Small Backpack
8. Fake arms (or simply fill some long gloves with stuffing and sew them to the inside of your sleeves)
9. Paint/paint prushes
Step 1: Find a Mannequin
Step 2: Fill the mannequin with industrial foam
Spray the inside of the mannequin with the mould release agent until about the waistline, and let it dry.
When the release agent is dry, spray it with industrial foam (ONLY ONE LAYER - I made the mistake of filling the entire mannequin right away and it took an extra long time to dry. Once your layer is dry, keep adding layer by layer until the mannequin is full.