@Syn7 Rash guards are required by CAMO rules
It's a point of contention for some with CAMO. All CAMO fighters are required to use only CAMO rashguards & gloves. I think the gloves are 7 oz. which is an odd weight as they are usually 8 oz for kickboxing or 4 oz for MMA (please correct me if I'm wrong here). Each CAMO fighter is issued gear and if it wears out, they have to replace it through CAMO. It's reminiscent of what sanshou tried to do in the early years, requiring that odd pleated regulation sparring gear, and what modern wushu tried to do with standardized weapons. There is a logic behind it, but then there's also an exclusivity factor that's controlling. What's more, for MMA fighters, the rash guard is a place where they can advertise. MMA fighters don't get paid a lot (they aren't supposed to get paid at all on the amateur level) so advertising helps defray training costs, etc. That being said, many MMA fighters (male) prefer to go shirtless. At the end of one fight, and I can't remember which one, one of the victors took off his shirt. The refs quickly had him back in it for the winner declaration.
I actually liked the rash guards. It was easy to tell red from blue.