--However, for about 45% of the people polled, the axiom of "buy quality, irregardless of expense, because quality clothing will last your lifetime" may not make sense, and for 8/30 or about 27% of the people polled, because their body type changes so much, it makes no sense at all because they know full well that they won't be able to wear it for more than a couple of years.
But do they really know that?

There may be some people who have a known condition, or are on a health program, and can predict that their body is going to greatly inflate (or deflate) in the next couple of years. And we do indeed see that all the time, where someone says he's on a diet, and is looking for an interim kilt until he reaches his ideal weight.

But for the majority of people, I'd bet, they don't know whether their body is going to change shape in the next few years. It's not like they plan for it to. Nobody sits down and says, "I'm going to just let myself go, and intentionally outgrow all my clothes." And indeed, buying high-dollar, well-fitting, quality garments would be a good motivation for maintaining one's weight!