When using a plain item of clothing such as a black hoody with the now working decals selected, Taking off your top or changing your outfit at a wardrobe does not remove the decal. It will just either float near the topless torso or try to apply to the new outfit.
Thank you for your help in alerting us to this bug, now that all of the required information has been gathered, it's been logged with the development team who will look to fix this.
Thread locked, awaiting development team response