From hundreds of years such vests and shirts were in the wardrobes of caliphs,sultans,rulers and even soldiers.
This kind of clothes has a long history in the muslim world,especially in the Ottoman empire.
This vest is a great protection for any kind of magic, from any jinn or bad spirit, from any calamity or disaster.
It protects its owner from any animal, from any poison, from any weapon - bullets, knieves...
It is also for respect. acception by people and recognition as a leader.
Here are some of the writtings imprinted on the vest - surah Yasin, sura Fatiha, sura Yusuf, sura Jinn, ayatul Kursi, holly names of Bais, Karim, Uahab
It can be wear under your clothes.