The DIY PacMan Costume was pretty inexpensive!  The only supplies I needed were cardboard,  hot glue, box tape, ribbon, and acrylic paint.  

The cardboard was free thanks to all the online shopping I do.  I already had the ribbon, the hot glue gun, the hot glue sticks, and the box tape, but those are relatively inexpensive to find.  I also already had the acrylic paint at home from that time my husband decided he was going to take up painting as a hobby.  

To create the PacMan body I first cut out 2 large circles roughly the same size.  Not all of my cardboard was big enough so I had to tape a few smaller cardboard pieces together to create a big piece to then cut my circle from.  

Once the circles were cut I had to decide where I wanted the mouth cut out to be.  I have seen people leave the circle whole and just paint a black mouth, but I think having the mouth cut out really makes a difference to the overall look of the costume.  

To connect the 2 circles I first had to decide how much space my son needed to fit in between since I wanted him to wear this PacMan costume like a sandwich board.  Once that was measured I used small strips of cardboard and hot glued them together for supports.  I did that all around the circle until felt secure.  You can sort of see how I glued the cardboard strips in the picture below.  

Once the framing was done and the strips were in place I took larger pieces of cardboard and taped them along the outside to cover up the framework, to create the enclosed look I was going for.  

After everything was glued and dried I got to work painting.  We first tried to use spray paint, but that just soaked right into the cardboard.  Acrylic paint worked best for us.