Matsuri destroying his clothes is such a blatant metaphor of how he breaks his cages when thinking about Urie, though. He no longer is restrained by him being married, a Washuu, a Ghoul, a CCG member, etc; he feels he can be who he wants to be. Also, I just thought of that scene where Yoshitoki FORCES him to climb the mountain, and the other one where he tries to FORCE him to do things. Freedom is a big deal for Matsuri. After being betrayed by V, he has nothing to lose, and can finally be free.