There are 2 version of Neckwear Bracket [One Stud].
The main difference is that the vertical side. 42446 is 3 LDU, 28974 is 4 LDU.
C in the image is a 36841 to comparison.
Thanks to NewElementary.com for the info and comparison image.
There have been some minor mold changes within the 42446:
Click on a colored part below to see the Sets and MOCs that use part 42446 Neckwear Bracket [One Stud] in that color. You can find an overview of all LEGO Colors here.
If a color is missing, it probably needs to be added to a Set Inventory.
This part has been used by MOCs in the following colors but not officially released.