You might want to ask for a refund from the storefront you bought it from, sooner rather than later.
As I understand it from numerous postings on the forums (and backed up by some googling for you) ESRB regions (including US) can’t get the nudity DLC. This is a consequence of regional censorship rules, and nothing to do with Funcom.
Personally I find the game fun enough without being totally unclad, but I appreciate that that is only a personal opinion. The game has a lot to offer, but if the lack of full nudity spoils the experience for you a refund is probably your only option.
See below for a previous response from Funcom.