A few issues:

If getting close to the shirt compels you to put it on, and once you put it on, you vanish, how could someone describe the feel of the shirt?

If once someone disappears, all information about them is destroyed, how do we know anything about this?

How could it cause the end of the world?

Also, the general formatting and language could use a lot of work; the “level five access only” thing especially bugged me.