The fashion industry and advertising in general do not set standards, they supply a product that sells. If this type of advertising didn't attract $$ in the form of buying product, it wouldn't be there. Blaming the industry is the wrong way to go about it. Blame the people outside the industry that are voting with their pocketbooks. Clearly the vast majority of people out there are influenced into buying product when presented with thin, boy-like models.
Really? Then who changed the "standard" from the Cindy Crawford "healthy" supermodel to what we have now? Did the buying public really stop buying clothes modeled by such women in favor of the super skinny...or at some point did the public simply stop seeing the healthier models?
Now, take twelve women all between 5'8" and 5'10" and 105 and 115 pounds. They will likely all fit well into the same dress with minimal alterations. Then at the same time, a woman who picks up a magazine has an easier time deciding how dresses will look on her if all the models wearing them look basically the same.
That sounds logical...but why wasn't it just as logical prior to the 1990s?