Boy does that change everything.
Did a few boxing only rounds and a few kickboxing. A lot of strikes are caught, even without true intention, some of them even after they hit the head. It really puts you off your game if you're used to striking without the gi. I'm a pretty good amateur gi player and have decent boxing and MT, but I lost most rounds to 2 guys not as good as me because I need time to adapt. A lot of time it went like that: I threw a jab, jab hit or missed, sleeve got caught on its way back, I got punched in the face while trying to figure it out. Other times the other guy just caught my hand and struck me. Weird experience, do try.