Tailoring has come back with its shoulders up. Glasses have noticed.

Every few years fashion remembers that it likes a straight line, and this is one of those years. The autumn/winter 2026 shows were full of strong-shouldered blazers and narrow trousers, with coats cut a size too big on purpose. Net-a-Porter’s chief buyer came away describing a return to structured tailoring. Milan went head to toe in black. Slate-grey suiting kept turning up, usually with something oxblood nearby.

Put a face on top of all that structure and a wispy, barely-there pair of glasses starts to look like an afterthought. A square frame has corners. It holds its own against a shoulder pad.

What the runways showed

Eyewear has been getting bigger and thicker for a few seasons. Bottega Veneta, Loewe and Balenciaga all sent out heavy, deep-set frames earlier this year, and at that level nobody’s pretending glasses are meant to disappear.

Saint Laurent’s take, shown for spring and still everywhere, is lower and flatter. It’s a square front with a short lens height, and it looks severe in a way that’s hard to pull off before coffee. Gucci’s autumn/winter 2026 eyewear leans on black acetate, with square sunglasses and optical frames that have real weight to them. There’s Havana tortoiseshell too, for anyone who finds black too hard.

The difference this year is that the clothes match. Square acetate itself never fully goes away, of course; every optician has had a wall of it for as long as most of us have needed glasses.

Which square, though

“Square glasses” covers more ground than it sounds like. The low-front version is wide and shallow with a whiff of the 1990s about it, and it’s the one that looks most at home with a suit. It’s also the least forgiving. If you’re not sure, you’re probably after the softened oversized square instead. This season’s big frames are broader, not deeper, and the corners have been rounded off just enough to stop them looking like safety goggles. They get on with knitwear and denim, which for most of us is what autumn actually consists of.

Then there’s the chunky acetate square, thick-rimmed, usually black or tortoiseshell. People will remember you by this pair. Some of them will start calling it your look. Be sure you like it before that happens.

Colour does half the work

Black is the obvious choice and there’s nothing wrong with it, especially in a season this keen on all-black dressing. The more interesting frames this autumn are in deep, warm colours: burgundy, tobacco brown, forest green, slate. Plain clear frames had a long run, and they’ve mostly given way to smoked and tinted ones.

These happen to be the colours in the clothes. Bottle green and ochre are all over the season’s collections. Tortoiseshell against a camel coat is hardly a new idea, and it still works. A burgundy frame next to a grey suit picks up that oxblood accent without you having to buy the shoes.

How to wear one

Proportion matters more than any rule. The frame should be roughly as wide as the widest part of your face, with your eyes near the centre of each lens and the top line following your brows. Too wide and the glasses slide down your nose all day. Too narrow and they pinch at the temples.

The runway never mentions prescriptions. If yours is strong, a bigger lens means a thicker and heavier one, and on a large square frame the edges are where it shows. Thinner, high-index lenses fix most of it. Ask about them before you fall for the largest frame on the page.

Weight matters in the other sense too. A thick acetate square with a heavy coat and a big scarf is a lot going on near your face, so let one of them lead. With a sharp blazer and not much else, the chunky pair works. Under a roll-neck and a long coat, the slimmer low-front shape is the better call.

Try a few widths before you commit. Virtual try-on has made that less of a gamble online, and retailers are stocking a wider range of square glasses for men and women than they have for years. The differences between pairs are bigger than they look in a thumbnail.

As for the old line that angular frames only suit round faces, it’s a starting point and no more. Knowing which glasses suit your face shape helps you narrow down a page of two hundred frames. After that, trust the mirror. Plenty of people with strong jaws wear square frames on purpose.

The case for one good pair

There’s a less glamorous argument too. If you wear prescription glasses, they’re the one accessory you put on every single day, so the cost per wear is tiny next to a coat that comes out twenty times a winter. A shape that’s survived this many trend cycles is a safer bet than whatever arrived last month.

And when your prescription changes, a frame you still like can often be fitted with new lenses. That costs less than starting again. It also means the old pair doesn’t join the others at the back of the drawer, where, if you’re anything like most glasses wearers, there are already three.