Didn't catch the undershirts

[Amesman]

HS Fr game starts and a couple of players for Team A are soon discovered to be wearing gray T-shirts under maroon jerseys. (Another player has maroon T-shirt underneath.)

Granted, the grays should have been caught before tip-off, but the horse is out of the barn at this point.

Team B's AC starts hollering for a T for "illegal uniforms."

We're at a FTA so partner and I direct the gray T's out of the game, telling them they are not properly dressed. They take the T's off (out in the hallway -- not at the bench) and a few whistles later re-enter the game.

No T served. B's AC acknowledged but not much else. Did we handle it right?

What if it was noticed / Team B starts making a ruckus about it during game action?