Separates probably are available locally to most men, but more often than not from low-quality brands and without in-store tailoring or necessarily competent tailoring available nearby. If the would-be wearer even has an idea of what the final result should be. Or knows that a sport jacket with odd pants is probably not a fair substitute for a suit when dressing up is required. Maybe it's that kind of introduction to suits - something complicated and lousy-looking - that puts men off to them for a long time. It certainly does someone with the major v-shape no favors when it comes to making impressions.
Another issue, especially for would-be makers, is that a huge drop doesn't automatically mean "weightlifter." Though an extreme drop will be less common in parts of the world without the rather American hobby of weightlifting, there will be some tall, thin men with the extreme v-shape just about anywhere. See a popular poll from about a year ago.
(By the way, "Search only polls" would be a nice option to add to the Search function.)
There doesn't appear to be any feasible, simple solution on the way.