wearing your ID without clothes

[Ikkonoishi]

The problem with the string/lanyard is you can't accidentally kill yourself with it. As for opening doors, I thought the doors responded to an RFID chip in the card or something-the AI can track you by your ID and beep sky always knows where to find you.

It seems to work more like a 3d barcode. It has to be visible to be tracked. If it is in your hand then you show up as Unknown if your face is covered.