We got the idea for a headless costume from others on your site. I bought a $5 large man's jacket from a thrift store, plus $8 for 2 plastic hands you can get most anywhere around Halloween. I used a large backpack & stuffed a pillow in it so it stuck out above the backpack, I found 2 pieces of plastic pipe on either end to make the shoulders a little more rigid.
The arms of the coat were stuffed with newspaper. I stapled the plastic hands to the wrists of the coat. The neck was a sour cream container that I taped to the pillow & then covered with a cut sleeve from an old white shirt. I used red fabric paint to add blood to the neck & coat. My daughter simply slipped the backpack on and we did the coat up, leaving a button undone for her head to come through.
The best part of this costume was that this coat had side pockets, so I was able to cut the insides of the pockets out & with my daughter wearing black gloves, she could put her arms through the pockets to hold her treat bag & no one really noticed her arms since they were black like the coat. She was a huge hit & total strangers stopped her to ask if they could take her picture.
My little guy wanted to be something scary for the first time this year, so he decided to go in a headless costume. I searched the internet for ideas and found this site. I got ideas from several submissions and incorporated it into this costume.
My husband coaches high school baseball, so I decided to make the costume using one of his uniforms. I found a rolling backpack with an extending handle at a yard sale for $5, and that's the only money spent to create the costume.
I lifted the handle, secured it in place. I took the hanging part of a coat hanger, bent it downward, and secured the hanger to the top of the handle and reinforced it so it wouldn't sag. The shirt was put on the coat hanger and stuffed with plastic grocery bags to keep weight at a minimum. I used one of my son's belts to secure the costume around his waist through the cloth hook of the backpack used to hang it and below my sons armpits and around his chest.
The neck was cut card board, put in a circle and taped with red tissue paper draped around it and taped to the card board. I cut slits on the sides of the bottom of the cardboard circle and slid it on the top of the coat hanger.
Got the idea from this site. My son used his hockey pants and socks and we bought a jersey from Goodwill ($3.99) I took his old back pack and stuffed it with old clothes then I duct taped (love duct tape) 2 lenghts of plumbing pipes to the side facing them forward slightly I connected them with yet another small piece of pipe at the top. I placed the Jersey over his head and marked his nose. I cut a hole just big enough to stretch around his head . With him wearing the back pack I put the jersey over the whole contraption and stuffed the shoulders and arms with batting, bending the arms and adding his "hands". Put a flesh covered cloth over the head and put some fake blood on that and his actual neck . The costume was a real hit and everyone loved it. It was easy and VERY CHEAP