WHAT THE SMALLeST SiZe?

WHAT is THE SMALLEST SiZE iN MENS iES? i WANT THE SHORTS iN KHAKi && NAVy i WENT TO WAL* MART BUT THEY HAD SiZE 30 WHiCH WAS A LiL TOO BiG 4 ME iM 12 yEARS OLD [GURL] LiViN iN WEST PAM FL, SO THNX iF U HELPED && TELL ME WHERE i CAN BUY it