Stabbed - Halloween costume idea

I just watched the old but excellent TV show The Borgias, where there's plenty of backstabbing, so I got inspired.

To make this costume, you'll need

• 4 printed parts:
  • The shoulder strap (Needs to be flexible, I used white TPU)
  • The dagger blade (I used silver PLA)
  • The dagger guard & handle (I used dark brown PLA for those 2)
• M4 x 30-60mm screw
• An old shirt you're ok to pierce at the shoulder (I was going for the medieval duelist aesthetic - inspired by The Borgias - so I bought a 5$ linen shirt in a thrift shop)
• Big rubber band to fix the strap on your shoulder (I used an exercise rubber band)
• Fake coagulated blood gel
• (Optional) fake blood

Instructions

• The blade has a hole at the bottom. Pass the screw through the hole in the middle of the TPU strap and screw in the blade (the length of the screw can be anything between 30 to 60mm). Pay attention to insert the strap such that the screw head is hidden in the strap hole (such that the metal does not touch your shoulder skin afterwards).
• Pass the big rubber band through both holes of the strap, such that it forms a loop. 

• Pass one of your arms through the loop, then attach the other ends of the band under your other arm, such that the whole thing is firmly attached.

• Pierce the shirt over the shoulder where you'll be stabbed, then pass it through the blade and wear it normally, then insert the guard and screw in the handle (it has threads).

• Apply fake coagulated blood gel around the point of entry (the gel is less liquid than regular fake blood - and gives a more goorish aesthetic)

• Optionally, let regular fake blood run down from your mouth, to create the effect that you're bleeding from internal wounds

Enjoy ! (I left the original Fusion file if you want to remix it for your needs)