For years I thought a belt was just the thing holding your trousers up, so I bought one, cheap, stiff as a ruler, and wondered why it cracked at the fold within a month. Turns out a belt is doing a lot more work than that, and most of the ones that let you down are let down by exactly the bit you can’t see when it’s hanging on a hook.
The difference between a good belt and a disappointing one is almost always the leather, or the lack of it. A proper leather belt has a bit of give to it, it moves with you instead of staying rigid, and it softens at the fold over time rather than splitting. Bonded or heavily coated faux versions tend to crease white within weeks and never recover. Check the edges too, a good one has them finished smooth, not just cut and left raw. The buckle matters more than people think as well, it should sit flush and not swing loose, and the prong should line up with the holes properly rather than landing between two of them, which is the kind of small annoying thing that ruins an otherwise decent belt. If you’re only buying one, make it a black leather belt in a mid width, something between two and three centimetres. It goes under the most things and asks the least of you.
Wear a slim leather belt through proper belt loops and let it actually show, not just function, it’s one of those details people register without clocking why an outfit looks put together. A wide belt wants to sit over something, not through it, cinched over a shirt dress or a coat rather than threaded through low rise jeans, where it tends to fight the waistband instead of working with it. Belts and big statement buckles are lovely on their own but start competing the second you add a bold necklace or anything with its own hardware, so pick one focal point and let the other one be quiet.
Where belts genuinely don’t help is on anything already fitted at the waist, a wrap dress, a tailored jacket with its own shape, they just add bulk you don’t need. And a wide belt on a very soft, unstructured top can look like it’s holding the fabric hostage rather than shaping it. The plain, useful line is this: buy for the buckle and the fold, not the colour, because the fold is where every cheap belt tells on itself first.