It's probably Maricris, but I hope that it's Wendy. That lapel thing was trivial compared to her other numerous violations, which recently included using the prayer room to diss housemates, conspiring with other housemates to make someone cry (Dionne), and sleeping in the living room, despite warnings that they can't take a nap anymore.
An hour before the live primetime telecast, most of the guys were called by Big Bro in the confession room. One by one they emerged, but Nel stayed in the longest. When he came out, he looked crestfallen and jittery. When they were teasing him about it during one of their smoking sessions, he excused himself and went to the toilet, and you could clearly hear him weeping behind the door. Maybe Kuya already informed him about Maricris being evicted?