The thing nobody tells you about summer loafers is that the back of the heel moulds to your foot in a way that looks fine in the shop and then, three weeks in, either stops rubbing completely or turns into a daily argument with a plaster. You find out which one you've bought somewhere around the fourth or fifth wear, usually on a day you've walked further than planned, and by then it's too late to take them back looking unworn. So the shop test matters more than it feels like it should: slide your foot in without socks, stand up, and walk a proper few steps on a hard floor, not the carpet near the till. If your heel lifts more than a few millimetres with every step, that gap will only get worse once the leather softens, and soft leather forgives almost nothing by way of a strap or buckle to pull it back in. Check the width across the widest part of your foot too, pressing with your thumb either side, because loafers that are a touch long but a touch narrow are the ones that end up at the back of a cupboard looking virtuous and unworn.
Once the fit's right, the rest is mostly about what you put them near. They sit badly with anything heavily tailored at the ankle, cropped trousers with a stiff turn up especially, because the loafer wants a bit of movement above it and a crisp hem just fights that. They also lose definition against very busy prints lower down, a floral skirt with a floral ankle sock is one outfit decision too many. What they're genuinely good at is covering the gap between formal and barefoot sandals weather, so they're at their best on days that start cool and end warm, an early meeting followed by a long lunch outside, a train journey into a city that's hotter than where you left. They work with bare ankles, with the thinnest invisible trainer sock, or with a slightly visible ribbed sock in a colour that's doing its own quiet thing, but anything thick underneath changes the whole proportion of the shoe and not for the better.
For colour, I'd steer towards tan, a soft taupe, or a proper navy before white or anything metallic, because those three go dusty and scuffed in an interesting way rather than a sad one, and they sit happily under most of what else is in a summer wardrobe without you having to think about it twice.
