A little info, because I think it's important:
EZLN is the Ejercito Zapatista de Liberacion Nacional (For non-Spanish speakers, ejercito is army, the rest are cognates), and the guy on the shirt is probably the famous spokesperson Subcommander Marcos. It's a revolutionary (sometimes violent) movement against the oppressive and corrupt elements of Mexican government to get rights for the indigenous people of Mexico, especially in the state of Chiapas. It started in the 90's and they're still active.
Know your human rights movement history.
And btw, cool dress. I also like how you did the straps