It looks like this Part has been superseded by LEGO Part 19888 Neckwear Cape, Standard [Spongy Stretchable Fabric].
Click on a colored part below to see the Sets and MOCs that use part 21841 Neckwear Cape, Standard [Shiny Spongy Stretchable Fabric] 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.
There are 3 Mold variations of part 21841 - Neckwear Cape, Standard [Shiny Spongy Stretchable Fabric] in the database, in use between 2015 to 2018. See Molds and other related Parts.