I've found this easy tutorial in Pinterest which I think anyone can also do. Basically it consists of preparing the following parts:

1. black head with a pair of eyes
2. spider arms (made of long black socks stuffed with scratch papers or newspapers)
3. black-long sleeved top
4. black pants/trousers
5. black shoes
6. pumpkin Halloween basket (to complete the look)
7. black gloves (optional)