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Step 1: Tools & Materials
Since you don't need a lot of fabric to make the collar, check out the "odds and ends" bin at your local fabric store. I got the fabric for this costume for under a dollar.
Step 2: Making The Hat
Step 2 - Apply a generous amount of hot glue on one side of the craft foam.
Step 3 - Roll the hat together and hold the ends for a minute or two while the glue sets.
Step 4 - Put a good dollop of glue on the tip of the hat and add the pom-pom.
Step 5 - Take one end of the elastic, place it inside the hat and staple, have the staple crimp on the outside of the hat. Put the hat on your dog to see how much elastic you will need to keep the hat on your dog’s head. Make a mark and staple the other end of the elastic to the hat.
Step 3: Making The Collar Pattern
Now draw a giant bulls eye on your paper. To get the diameter for the hole of the collar, divide the circumference by 3.14. Take that number and center it on the bulls eye mark, up and down and side to side.
To complete the circle, connect the marks with curved lines. Making the outer circle depends on how large you want your clown collar.
As much as I sucked at math, it can come in handy sometimes :D