Shama-il Tirmidhi Chapter 14, Hadith Number 2 (104).
It was not against tawakkul (having complete trust in Allah) for the Prophet of Allah sallallahu alaihe wasallam to wear two armours. Firstly, according to the sufis, ‘Kamaali Suluk’ (The perfection of seeking) is to return to bidaayah (the beginning), that is, in general dealings to behave like the common people, and the following of the Shari’ah must become a habit. Secondly, the Prophet of Allah sallallahu alaihe wasallam did these things to teach the ummah. Thirdly, Allah Ta’ala says in the Qur’aan, “Oh you who believe (when fighting the non-believers) protect yourselves (against their blows, etc., and also by wearing armour etc.). Then (to fight them) come out singly or collectively (as the necessity arises).” (4; 71) Therefore in preparing arms for protection, one will be following the injunctions of the Qur’aan. And who else can obey the commands of Allah Ta’ala more than the Prophet of Allah sallallahu alaihe wasallam? By this, the use of all forms of protection is intended.