If you want to make the cutest villain in the Mario Bros universe, here is the pattern to make his beautiful spiked shell.
This downloadable pattern will allow you to make a shell the size of a good backpack, mounted on shoulder straps.
If you're planning on making a Bowser or Bowsette costume, that works too. I simply suggest that you make the spikes a little longer.
The pattern is offered in one size. The finished shell is approximately 35cm x 43cm. It is possible to make the shell larger or smaller, by changing the print percentage.
You just have to make the straps of the size necessary for the shell to hold well.
And if you want to test another material, like the worbla, go for it ! Do not hesitate to share your project with me.