Those symbols and skeletons are mostly worn by non-Muslims. Imitating non-Muslims is prohibited. The Prophet (peace and blessings of Allah be upon him) said: “Whoever imitates a people is one of them.” (Abu Dawud, it has been graded as an authentic hadith)

It also was narrated that `Abdullah ibn ‘Amr ibn al-‘Aas said: The Messenger of Allah (peace and blessings of Allah be upon him) saw ‘Ali wearing two garments dyed with safflower and he said: “These are garments of the kuffar, do not wear them.” (Muslim)

On commenting on this hadith, Ahmad Shakir said, “This hadith clearly indicates that it is prohibited to imitate non-Muslims’ dress, way of life and appearance.