Lyn already identified Sulli's outfit from f(x)'s 130801 performance on M Countdown (you can check it here) and now we are going to find out what Victoria wore.
She wore the I and the world applique t-shirt from JUUN.J which you can buy here
Unfortunately the black version isn't available. :(
Sulli also wore the t-shirt at f(x)'s 130701 performance at Hong Kong Dome Festival.
Credits:SM,Juun.J,FX flowers