This year I decided to DIY my costume, so I found an inspiration online and then made this:
My little one helped some parts of it, like coloring it and using the glue gun to glue pieces together. We went out with it in a festival. I would say some people were impressed.
There are a few flaws of it, but I will settle.
However, I am thinking next year my costume will be an advanced version of it. For example, I can add the jaw next year. All I need is a rounded anchor on both sides and another cardboard to connect with it. Maybe I can reinforce the back a little and then add two fake legs. So it will become something like this:
In fact, maybe each year I can do a more advance of it. Hmm, maybe that will not be a good idea, eventually it will wear out or become too heavy.