Under his cloak, Sasuke is wearing (what seems to be like) the headband that Naruto gives back to him in 699..
I know its not a big deal but I just find it cool that Sasuke would keep it on himself
Of course he still has it, why would he not. Its dumb to believe that he doesnt have it, simply based on the last... He likely didnt have it in the last because the movie was done before the design for RSM was complete