The economic situation has nothing to do with shooting fashion. By the time you have the skills and experience, this "economic" situation will be all but over. Figure 5 to 10 years before you are ready take on the assignments from magazines like Vogue. Along the way, you will be buying your camera system so you not only have the skills, but the right tools as well.
What you need is a lot of experience shooting models, lighting and following the directions of the art director.
Of course I am assuming that you can shoot any camera, anywhere, under any conditions and produce marketable images on demand.
There are many ways to get the education and the experience, but some are faster than others. I would suggest you spend some time in school learning photography, getting an internship with a local studio photographer and joining ASMP as a student member, networking with the local working pros.
Upon graduation (or completing your photo classes) work as an assistant to one of those you have been networking with while in school and learn the business side of being a pro.
Along the way study the different regional Vogue magazines (US, UK and UE to get a taste of what the photographers are doing in those markets.
Actually I have been shooting more ad shots since the economic downturn. Businesses who did not have to advertise during the hot economy of the previous eight years, now actually have to remind people that they are still in business. This means spending more advertising dollars.