It would appear there is going to be an announcement (later today?) that someone is going to begin selling official Brotherhood apparel. There seems to be some speculation that it is a NIL-type operation that will put money in the pockets of Duke players.
A website has been launched, though you need a password to get into it at this time: https://thebrotherhood.live/
Also, the DukeMBB twitter account tweeted this a short time ago: