Official IMPACT shirt required.
According to Mike Johnson at PWInsider, IMPACT Wrestling officials have put a rule in place stating that talent can only wear official IMPACT t-shirts on television. Meaning, if a talent is selling a shirt through Pro Wrestling Tees or any other outlet, they cannot wear that shirt while on IMPACT television.
A look at the IMPACT Wrestling Shop shows that many of the top talents on the show have signature t-shirts. Aside from the obvious names such as Johnny Impact, Brian Cage, Sami Callihan and Michael Elgin, undercard talent like The Rascalz, The North, and Su Yung also have t-shirts available in the IMPACT Shop.
Most of the top names also have shirts available on Pro Wrestling Tees as well, with a wider selection to choose from. Talent appearing on Independent shows can continue to wear non-IMPACT shirts on those shows.
While this would seem to be a good move overall in terms of company branding, it's a rough time for IMPACT Wrestling right now as they are having issues with Pursuit Channel and top names Killer Kross and Scarlett Bordeaux recently requested their releases from the company. You can find out more about Kross' release request by clicking here.