Miu Miu was born in 1993 from the independent and unconventional spirit of Miuccia Prada, and the Prada Group still describes the label as the most unrestrained portrayal of her creativity. Its sunglasses carry that mood in two shapes. The Glimpse is a rectangular acetate frame with a low profile front and thick temples, the vertical logo set right into the hinge. The Regard is the softer one: a sophisticated oval in acetate with thin rims and ultra-flat lenses, offered in honey tortoiseshell. Black and tortoise do most of the talking.

Harper's Bazaar put the appeal plainly, calling the brand's statement sunglasses the most polished way into the y2k revival. I get it. The shape is the whole point, and plenty of people want the shape without the logo on the temple, or in a tint the original does not make, or simply from a label that is on the shelf this week. So this Miu Miu sunglasses dupe edit is pieces from other labels that share one idea: a thick, low rectangle, a slim oval, a tortoise that glows.

The bold rectangles come first. The Vivian from WMP Eyewear is a chunky black acetate rectangle with a sharp browline, and it is the one I would put on first with a camel coat. The Miller from Elisa Johnson is gloss black acetate with a thick bridge, which gives that heavy, low-set front. The oversized square from FREYRS is black acetate, a little softer at the corners. For something slimmer, the Marc Jacobs rectangle has smoky gradient lenses, and the Dira from Kendra Scott adds olive gradient lenses and metal temple accents.

Fitting test: look at the side of the frame, not the front. A bold rectangle earns its look from thick, even temples and a bridge that sits low, so hold each pair up and check that the thickness matches from corner to hinge.

Oval wrap shapes live or die on proportion. The original oval is described as having thin rims and ultra-flat lenses, so the thing to match is a narrow frame that sits close to the face, not a rounded bubble. Tilt each pair toward a window: the lens line should look flat and even across the front.

The Aria from FREYRS is the chunkiest here, a black acetate oval wrap with dark blue lenses, and I would wear it with a gray wool coat and a black turtleneck. The Taya from Fifth & Ninth is a slim black oval with dark gray lenses, the easiest daily one. The Outta Love from Le Specs is a narrow black oval with gray lenses and a 90s mood, and the Tory Burch Miller is a glossy black oval with gradient gray lenses. If you like a softer outline, the COACH pillow-oval and the Ray-Ban oval with its green lenses both round the corners without losing the black.

Polaroid brings bold black ovals with beveled temples, and the Nina from Fifth & Ninth is the oversized, narrow one for people who want more coverage across the front.

Pairing idea for October: a slim oval with a leather jacket, tights and loafers, or with a knit skirt and a scarf pulled up high. Check that the temples do not splay when you put them on; a wrap shape only works if both sides sit flush.

What I would skip: very round lenses, if what you want is the long, low oval. They read as a different pair of glasses altogether.

Tortoiseshell is where an alternative can fall apart, so use the light. Acetate glows and shows depth because the color runs through the sheet, and a good tortoise pattern should vary and glow when you hold it up. A tortoise that looks stamped and opaque is the one to leave on the shelf.

The Pilferer from Le Specs is a slim tortoiseshell rectangle with brown lenses, the narrowest of the group. The Alex Bio Acetate from Mulberry is lightweight tortoiseshell acetate with brown gradient lenses, and the Alix from Elisa Johnson is brown tortoise with blue lenses, which is the one that surprises people in a good way. The Carolina from Kate Spade New York has dark gradient lenses. The Dee from Kate Spade New York is a squarer tortoiseshell with brown gradient lenses, and AIRE brings the Sculptor in cookie tortoise and the Nightglow in dark tortoise with green lenses.

How I would wear them in autumn: tortoise sits well with oatmeal knits, brown suede and a white shirt. Dark tortoise is the safer pick if you wear a lot of black, since it reads almost like black until you catch the light.

Also check the hinge. Metal hinges pressed into the frame, rather than molded in, are a good sign of a frame that will hold its shape.

What I would skip: a tortoise print that is flat and one shade everywhere. It looks like a sticker next to a layered one.

Thin metal ovals are the lightest way into this look. The honest trade is clear: acetate is heavier and stiffer, while metal gives a slim, minimal silhouette. If the bold frames feel like a lot on your face, this is where I would start.

The Verona from WMP Eyewear is the bridge between the two worlds, a slim black oval with gold temples and dark lenses. Le Specs has two: the Icicle in silver-gold wire with clear lilac-tint lenses, and the Poseidon Deux in thin gold metal with brown polarized lenses. One rag & bone oval is gold with brown lenses and tortoiseshell temple tips, and the other, in dark metal, has rose-tinted lenses. Ray-Ban brings a gold oval with warm tinted lenses and a black oval with gray gradient lenses, and the Titan from Chimi is thin gold with green lenses.

Wear them with a white tee and a blazer, or with a black column dress for evening. A rose or lilac tint warms up a gray day, and brown lenses go with anything tan.

Fitting test: press the nose pads gently and check that they are adjustable, then look at the temples from above. Metal can show wear at the hinges and finish, so run a thumb along the plating and look for even color.

What I would skip: thin frames in a size that is too small. The oval should sit a little wider than your cheekbones.

Optical frames carry the same shape into the other half of your day. A thick-rim, low rectangle that makes a sunglass look sharp works with clear lenses at a desk, and the black and tortoise rule still holds. Hold them to the light, check the polish, and look at the edges of the temples.

The Tory Burch 55mm is a glossy black acetate rectangle with blue-light-filtering lenses and comes with a case and cloth. The second Tory Burch has a glossy black front with metal stitch detail and acetate temples. The Ray-Ban 55mm is a black acetate full-rim rectangle, and the RALPH is shiny black acetate with demo lenses. The Avery from Elisa Johnson is a dark tortoiseshell rectangle with clear lenses, and the Sferoflex is polished black acetate with a slim rectangle. The Paige from Elisa Johnson is slim gloss black, and the COACH is black with logo temples.

Pair them with a gray turtleneck, a trench and loafers for a weekday, or leave the lenses at home and wear them with a velvet blazer in the evening. For October, a dark tortoiseshell frame works well with plaid and wool.

Buying test: the listing should name acetate, and the frame should feel substantial rather than hollow. Weight tells you quickly.

What I would skip: a rim so thin it looks like wire if you want the chunky Miu Miu look. Optical frames are only a look-alike if the rim has some thickness.

I would begin with the face and the habits. If you like the low, thick rectangle, I would take a black or gloss black acetate pair and check the temples first. If I wanted something softer, the slim black oval comes next.

Then the color. Black goes with everything, and tortoise is the one that warms up a gray October coat, so I would hold it to the light before deciding. A thin metal oval fills in for the days when a heavy frame feels like too much.

Back in 1993 Miuccia Prada turned an unconventional spirit into a label, and the nice part is that the look is still just one idea: a shape you wear your own way.