Shirts That Are Uncommon
If you see an odd human face allegedly emerging from the red shirts, you are not hallucinating. You are merely exhibiting a phenomenon known as facial pareidolia. Our brain is wired in such a way that it is capable of detecting definite patterns in randomness.
There is a strong possibility that these are just garments, and Voldemort will not emerge from them. However, we cannot help ourselves since this is the way our mind operates. However, this does not make it any less disturbing.