I think the OP was concerning RCIA: I am assuming the young man is seeking the RCIA of his own volition.
Here:
https://www.catholicfaithstore.com/daily-bread/rcia-welcome-catholic-church/
If so, take the f'ing hat off, it is that simple.
Hats indoors, besides what is asked by the church you wish to join, means zero to me. In my part of Maryland ball caps are almost a requirement
