Paddy, there are freelance journalists, of course, but they generally write for the magazine world rather than for papers (though even the papers use them -- the NY Times has plenty). I myself work with several off and on, and they customarily have their list of client magazines with whom they regularly work, but they are not employed by any particular organ. some of these people are leading journalists. One of them was killed recently in Iraq.
Lifepower, El Gran Pollo is essentially correct, you will have to proceed on an ad hoc basis. But this is really quite easy. You simply contact the designers or Company employee in charge of PR and explain what you want. It is not so closed here as it is in other countries, you shouldnt have much trouble (provided you speak Spanish). They can even help you to attend events. It is a small network of people here, once you are acquainted with them, the procedure is automatic. DR fashion designers are beginning to get noticed, some of them have achieved world status, and I bet they would be interested in cooperating with you in order to keep that momentum going.
Like I say, if you need anything feel free to contact. I am a freelancer myself.