Headwear for religous reasons

[BillyMac]

Originally Posted by Scratch85

3.5 SIT B ...

3.5 SITUATION B: The officials are on the court prior to the game observing the
team warm-ups. One official notices that a member of Team A is wearing a decorative
necklace. RULING: The official should inform the team member to remove
the jewelry immediately. Upon compliance, the team member may continue to
warm up with his or her teammates and may start the game without penalty.

Obviously, from the casebook play, we don't let them warm up with jewelry, it's a safety issue.

The casebook citation (above) is for 3-5: Team Member’s Equipment, Apparel, it's not just for jewelry.

How about letting then warm up with an illegal color undershirt?

It's not a safety issue, it's an equipment fashion issue.