Removing jersey

[letemplay]

Approx 2 min prior to tip-off, Team B removes their warm-up tops revealing to officials that each player is wearing a white tshirt under a blue game top. (Team A is wearing white.) Officials notify Team B HC, the undershirts must go, whereupon ALL Team B players go to bench area and begin stripping to bare chest to get these shirts off and blue tops only back on. Some are even still struggling to get this task completed as both teams come on floor to line up for National Anthem.
If game has not yet started, are players in violation of 10-3-6 (h), and if so, what is penalty(s).