Since he couldn't foresee tshirts and shorts, he surely was a false prophet.
1Cr 14:37 If any man think himself to be a prophet, or spiritual, let him acknowledge that the things that I write unto you are the commandments of the Lord.
Since your church rejects the things St Paul writes in Corinthians you must be a bunch of non Christian false prophets.
St Paul spoke of such folks also.
Act 20:29 For I know this, that after my departing shall grievous wolves enter in among you, not sparing the flock.
Act 20:30 Also of your own selves shall men arise, speaking perverse things, to draw away disciples after them.