A good pair of shoes should solve a problem before it creates one, and most of the shoes that let me down over the years looked right in the box and wrong after forty minutes on my feet. That's the whole test, really. Not how they photograph standing still, but how they behave once you've actually gone somewhere in them.
There are honest limits here. Heels with a thin stacked heel and no real platform are a mistake on cobbles, on grass, on anything other than flat pavement and a short walk, and I've learned not to fight that rather than pretending a cushioned insole will fix a bad last. Mules look wonderful and slide off the back of your foot the second you have to hurry for a bus, so they're a sitting down shoe more than a walking one, and I'd rather admit that than carry on blaming my feet. Flats and loafers earn their keep through autumn and into a mild winter, but suede ones meet their match in actual rain, and a court shoe in patent will mark if you catch it on a kerb, so I keep those for days I know I'm mostly indoors. As they wear, leather uppers soften and take the shape of your foot within a few weeks, which is exactly what you want, while the sole is the part that gives first, especially on a smooth leather sole with no rubber half piece added. A wipe with a damp cloth, a proper shoe tree or even stuffed paper overnight, and keeping them off a radiator rather than on one, adds months to the life of almost anything leather. What separates a shoe worth having from one that disappoints is mostly in the parts you don't notice straight away, a lining that's actual leather rather than a shiny synthetic that goes clammy, stitching along the welt rather than glue alone, a heel that's built with a proper core rather than hollow plastic that flexes when you twist it. Hardware should sit flush and feel weighted, not light and rattly. As for clashing, a delicate strappy heel looks wrong under anything heavy or structured on top, and a chunky wedge fights a floaty, fine fabric dress rather than grounding it the way it should.
Tomorrow morning I'd put a plain black loafer with slightly cropped straight leg trousers and a jumper that's a size too big on purpose, nothing else doing much work, because the shoe's already said everything that needs saying.