This is the simplest Funniest costume I have ever made!
First ,acquire a newborn or very cooperative child.
I started by swaddling the baby in a white fabric sack. I made a sack, but a sleep sack would be ideal ,also.
Then I used an entire bag of spider webbing to wrap up the baby from feet to neck.
Once the webbing was secure, I used a wired poseable spider that I created from wire, fabric and fur. It would have been cheaper and easier to buy a spider , but I wanted to make my own.
I placed the baby in a portable basinette that I covered with orange fabric.
The baby was a huge hit this Halloween
This only took a couple of hours to put together.
I might try an adult version next year.