*UPDATE*
thanks for all your support and feedback! i already sent a cease & desist letter to them. i hope it works so that i don't have to take the legal course. we don't have the best law enforcement here, sadly, so it's not really the path i want to go through. as for now, i can only wait. wish me luck.

i went to a mall this afternoon and i found this in one of the store:
and i soon realized it's taken from:
they've never contacted me whatsoever about the usage. i'm furious but i try my best to stay calm and not start flaming their facebook page and call them art thief (though i really want to).
i looked for their website but it seems inactive. don't have any e-mail whatsoever but i do have a contact person and an address from the store clerk. maybe i'll start from there. however, seeing the kind of law we have here, i am a little bit pessimistic it will all go well.

btw the clothing brand seems to have a branch in singapore. if you reside in singapore, can you please check if they also have it there? it's called factor outfitters. thank you.
I was so busy with my exams and study stuff, that I haven't had a look on dA for a long time - but THIS is really so annoying - and so frustrating!
I really cannot stand people who use art of other people without asking - but here it's stealing! the sell this - and it's your idea, your mind, your art - whaa, I'm really pissed off of these people!!
I really hope you can find a solution and don't have to go the way of law if it is so "nice" there .... :/
Such assholes. Good luck sweetheart.