These are part of an Alex DeLarge costume, the charming yet ultra-violent character in the movie A Clockwork Orange. I couldn't get the great looking original by guydebored to slice in Slic3r, the model didn't seem to be manifold, and Slic3r was not able to repair it. I was able to load it into Blender and remesh and smooth the model fixing the issues and making it smoother in the process.