while not a true thread body, threads are the majority. Here's what I did last year (glass bead underbody)
... that top RH one pulled in a 26"+ brown.
Have done a few different versions using this stuff (called Eyelash) - some bass patterns, wet patterns, leeches .... thread and thread type bodies can be - and are - just as effective as dubbed, palmered, or encased common body style flies.
Now - thanks ot Buddy - I have more methods to trial with this winter .......