Don't know where to find that particular outfit, but to aid others:
The screenshot is from the Posebox Category, page 2, on:
http://blog.naver.com/avikapangGoing by the credits listed for the CC used, one of the possible creators of said outfit could be:
MYOS, Aug, Stefen, TK, Kangbkl, Tifa, Rapgirl, Ella, Calvin Cao, Raon, Peggy, Zanki, or AvikaPang
All of this found via the URL in the image posted.