This probably will sound shocking and will strike in the same time, but NEW and CLEAN do not always go along, especially if we are talking about clothes.
Answer this question: Do you wash the clothes after you buy them? If the answer is NO, you should be aware that you may be exposing yourself to very dangerous bacteria.
One team went to shopping and the purpose was scientific research. Namely, they bought few items from regular stores and also from second hand stores and after that took them to the laboratory on examinations.
They took a swab from each of them and let the samples incubate in a period of 24 hours. The next day when they opened the petri dishes, outcome was disgusting.