Rectangular dress watches bring a little structure to the wrist without feeling too formal. Their long, slim cases make a clean line, while a pale dial and leather strap keep the look understated. It is an easy shape to wear with tailoring, knitwear or a simple evening look.

A good rectangular dial needs only a few thoughtful details: clear Roman numerals, a fine minutes track, slim hands and a small polished crown. A rectangular case can feel elegant without being precious, and this edit gathers watches from different labels that interpret the shape through their own dials, metals and straps.

Start the walk with leather, because the strap is what makes a rectangle read as a dress watch. The Seiko Essentials in black croc-embossed leather has a slim silver-tone case and a white Roman dial with crisp, easy-to-read markers. The Coach Saddle is taller, gold-tone, on a tan strap, and I would wear it with a camel coat. The Olivia Burton Mini Grove is tiny at 16mm by 20mm, with a champagne dial. The rag & bone Brynn goes darker, with a black dial and daggers at 6 on Italian leather. The Tory Burch Eleanor Slim and the Fossil Raquel round out the line, one cream and black, one saddle brown with Roman markers.

My October tip: match the strap color to your bag or boots, then check the strap slips into the case without a visible gap.

A leather strap dresses a watch up, while a metal bracelet reads sportier and more durable, which is the plain way Harper's Bazaar puts it. Roman numerals stay, and the metal shifts the mood. This group is steel and gold-tone bracelets with a rectangular face, and it is the easiest to wear every day.

The Seiko Essentials in stainless steel keeps the white Roman dial and adds navy hands for a small color accent. The Citizen Bianca is a 28mm silver-tone case with blue hands and a solar Eco-Drive movement, so there is no battery to think about. The Fossil Raquel has octagon-edged corners on a slim steel bracelet. For warmer metal, the Olivia Burton Mini Grove in two-tone and the Tory Burch Eleanor Mini on a gold-tone double-wrap bracelet are the small ones, while the Coach Reese adds crystal-set bezel edges around a champagne dial.

In the fitting room, shake your wrist and watch the case. A good bracelet drapes and the case should not slide over the bone. Run a finger along the links for any rough edge. I look for links that feel smooth rather than chunky. The Bulova Sutton with a gray mother-of-pearl dial and the Calvin Klein CK Light in blush pink are the soft options.

What I would skip: a bracelet much wider than the case, because it makes the face look like an afterthought.

Soft-cornered squares feel more like jewelry than a sharp-edged digital screen, which is why I reach for them when I want a watch to finish an outfit. Look for a case with gently clipped corners and a warm finish. A square that is too sharp reads like a calculator, while a soft one reads like jewelry.

The Bulova Futuro Quadra has a gold-tone case with trimmed corners and a champagne dial, and it is the one I would put with a black turtleneck. The Timex gold-tone square keeps a white Roman dial on a gold-tone bracelet. The Olivia Burton Grosvenor is a soft square at 28mm with a textured bracelet, the largest of the group. The Peugeot has a square case on a black leather strap, which makes it the dressiest. At 18mm the Tory Burch Kira is tiny and neat, and the Caravelle goes black on gold in a rounded-square case at 17.5mm.

Two more to note: the Guess has a small square case with a blue dial, and the Calvin Klein CK Meridian has a gold dial with a wide link bracelet, bolder than the rest.

Test the gold-tone in daylight. Hold your wrist near a window and see whether the finish looks warm and even, or brassy. Pair it with the gold you already wear, since mixing too many yellows can look busy.

What I would skip: a gold dial on a gold case if you want numerals to stand out, because they will melt into the face.

Small watches are back in rotation, with slim straps and delicate chains making a subtle statement on the wrist. I like this group of petite dress watches for the way their small cases feel light, even with a metal bracelet.

A square case with rounded edges can feel polished without overpowering the wrist. Here the shapes shift: the Seiko Essential is a tiny 15mm gold-tone rectangle with a champagne dial, and the Olivia Burton Mini Grove is a 16mm gold bracelet watch. The Olivia Burton Rectangle has a gold bracelet and a silver sunray dial inside a crystal-set bezel. The Caravelle is a small oval with a white Roman dial and a flexible gold bracelet, the Citizen Fio has a gold mesh bracelet, and the Fossil Scarlette Mini adds a fluted bezel. The Tissot Desir has a mother-of-pearl dial and the Coach Greta is a polished tonneau.

The buying test for a small watch is the finish. On a petite case, crisp edges, a clean dial and a clasp that lies flat make all the difference.

What I would skip: a case so small that you cannot read the numerals without squinting, since a dress watch still has to tell the time.

Roman numerals are a detail that gives a rectangular watch a dressed-up, classic feel. When I scan a dial I look for crisp, evenly spaced numerals on a pale ground, with hands that are easy to read.

The Timex Addison has a squared-off gold-tone case, a sunray dial and a brown croc-embossed strap. The Seiko in gold on black croc-embossed leather keeps a 19.6mm case, while the Seiko Essentials Quartz at 22.2mm has a mother-of-pearl Roman dial on brown croc. The Citizen Bianca at 32.5mm has blue hands on a silver-tone stainless bracelet, adding a small point of contrast. The Anne Klein is a rectangular alloy case with a link bracelet, the Caravelle in black leather is a small oval, and the Longines DolceVita is a Swiss rectangular case with a cream Roman dial and a sub-dial. The Stuhrling Elan has a crystal bezel and a date.

Test it by holding your wrist at arm's length. If you can read the numerals and see the hands clearly, the dial is working. Pair it with a white shirt, a gray knit and a leather strap that matches your belt.

What I would skip: a date window or sub-dial if you prefer an uncluttered face, since extra marks crowd the numerals.

My order would go like this. Pick the strap first: black leather if you live in gray and navy, brown if your wardrobe is camel and cream, a bracelet if the watch will go to the gym bag too. Then pick the face, a white or cream dial with crisp Roman numerals and slim hands. Last, check the case size against your wrist, because a small rectangle is a quiet thing on a thin wrist and an assertive one on a broad one.

The rectangular dress watch I would reach for first is the one that looks right at arm's length, with clear markers and a comfortable strap. I would choose the silhouette that feels natural with my wardrobe, then leave extra details to the rest of the outfit.

If the Cartier Tank watch is already on your list, I think these rectangular styles are worth considering too.