Based on lourensaurus' invisible tie clip, that unfortunately broke when I tried using it. The original STL had a small gap between the two main parts leading to a weak connection that I couldn't fix with slicer settings. I changed the model so that it has a stronger connection between the two clip parts for more strength.
From the original file:
This print clips or pins onto the label or "keeper loop" of your tie and then also onto the placket of your shirt, holding your tie neatly close to and in the center of your shirt.
Head over to the original file and give it a like for the original idea :-) https://www.printables.com/model/193633-invisible-tie-clip
The author remixed this model.