Lack of options for certain sizes is part of the problem, alas. Ever see how crappy most plus-size clothing is for women? It’s unreal. The options are ugly and made like shit mostly. I try to invest in good shoes–my interview shoes are hand-stitched things I got in Scandinavia 14 years ago and they look like new, and I’m wearing a new pair of Doc Martens as we speak.
Still, stuff like women’s underwear just disintegrates mostly, and most of the pants available are cheap/thin or just fugly.
And, even for “better” brands, staples like a plain white work blouse are semi-disposable these days–stain easily and either expensive to dry clean (if synthetic) or just thin/cheap/gross/wear out in a season (if cotton).
OTOH if I find a sturdy pair of pants or jeans in my size, I buy 3 pairs and hang on to them for dear life.