Shaykh Al-Islam says, regarding the Allies of Allah:
The allies of Allah do not have any special appearance with which they differ from other people. They have no special dress other than just being permissible dress, and are not distinguished by shaving of hair, or cutting it short, or braiding it, as long as it is within the permissible. Thus it has been said: “So many truthful believers in rough dress, and so many apostates in beautiful cloaks.” Rather, the allies of Allah are to be found in all categories of the nation of Muhammad, except for the fact that they may not be found among the people of blatant innovations (bid’a) and moral corruption. They are found among people of the Qur’an, scholars, just as they are found among the fighters of jihad with weapons, and they are found among the businessmen, the manufacturers, and the farmers.
Taken From: The Criterion Between the Allies of the Merciful and the Allies of the Devil, pg. 37