Mostly made, obviously. Few little boys have an innate desire to dress up. Mostly, it is burdensome to them. I can recall one time my mother got me all dressed up in a little white suit for some special occasion, and for some reason I can't articulate at this late date, I jumped in our slimy fishpond! She beat me and beat me and beat me some more for that, which was her usual way of discipline. I can't say that I blame her for that one!
However, as others have pointed out, some people are naturally gifted with physiques that make them look sharp in dressy clothes. I think President Obama is a good example of this. I don't think he is a very knowledgeable dresser, and he makes some egregious stylistic errors, yet most people rate him as a sharp dresser. On the other hand, Rod Blagojevich has a much finer wardrobe than Obama and is evidently a more knowledgeable sartorialist, yet he doesn't look particularly elegant. (The haircut doesn't help.)
In conclusion, I would say that sharp dressing results from a fusion of natural physical gifts (exercise can be very remedial here), desire, knowledge and means. Whether there is such a thing as innate good taste or good taste osmotically acquired from a genteel, aesthetic upbringing, I am not sure. I have known a number of men with impeccably patrician antecedents who are tasteless, horrible dressers.
Means I would rate very low on the scale of importance. A wardrobe can and should be built up gradually and piecemeal. Unless one is sunk in abject poverty, one can acquire good clothing and shoes and be very well turned out, certainly compared to most of the male populace. Compared to many hobbies, sartorialism is really relatively inexpensive.