Hi guys, I had a brief search for this in the forum but didn’t find anything relating to it.
I’m currently playing on the latest experimental build.
So yeah, I found out the hard way that if you (A)ctivate the Toolbox, Select “Cut up and Item” and choose a garment to cut up, it will still consume the 25 Duct Tape requirement as if it were repairing an item made of Wood, Paper, Chitin or Bone etc.
Just bringing it up, I’m off to slay blobs and make more gaffer tape now 
EDIT: Just found that you need Duct tape in it at all to access the menu to cut up fabrics. So I guess that’s where the issue lies.