Crewneck, V-Neck or Mock: Pick by Your Shoulder Width

The quick answer: Measure two things — shoulder width point-to-point across your back, and the gap between your jawline and collarbone. Shoulders past 16 inches read best in a V-neck or soft scoop; a neck shorter than two fingers needs a mock collar under two inches tall. At Sonverdano, those two numbers settle the neckline question faster than any body-shape chart.

Most knitwear advice stops at "apple, pear, hourglass," which tells you nothing about where a sweater's ribbing will actually land on your collarbone. Necklines are a geometry problem: a horizontal line across a wide frame adds width, a vertical opening adds length, and a tall collar eats whatever neck you have. Two measurements and one fitting-room test solve it. Fit is not a small issue, either — industry analyses reported by Business of Fashion have put fit and size problems behind roughly 70% of fashion returns, which is why guessing at a neckline is an expensive habit.

1. How do I measure my shoulder width and neck length at home?

Shoulder width is the distance across your upper back between the two bony points where your shoulders end, and neck length is the vertical gap between your jawline and your collarbone. Both take under a minute with a soft tape measure and a mirror.

1. Find the bone. Run your fingers out along the top of your shoulder until you hit the knob where the arm starts to curve downward. That's the acromion — your true shoulder point.
2. Measure across the back. Have the tape travel across your upper back, not over the front of your chest. Keep your arms relaxed at your sides.
3. Read the number. For most adult women, under 15 inches is narrow, 15–16 inches is average, and over 16 inches reads broad in clothing.
4. Check neck length with fingers. Tilt your chin level and stack fingers flat between the bottom of your jaw and the notch at the base of your throat. Two fingers or fewer means a short neck, three means average, four or more means long.

The finger test beats a tape here because it scales to your own hand and your own frame. Write both results in your phone's notes next to your bra size — you will use them every time you shop women's sweaters and jumpers online.

2. Which sweater neckline is best for broad shoulders?

For shoulders measuring over 16 inches, a V-neck or a moderate scoop is the safest choice, because both break the horizontal line that a crew draws straight across your widest point. A shallow boat neck and a wide off-shoulder are the two to skip.

Here's the quick cross-reference for the two numbers you just took:

A cardigan worn open behaves like a permanent V, which is why it works across almost every row in that table — the Ariana Bow Knit Cardigan is an easy default if you keep landing between categories. For a closed knit, browse the shallow-V and scoop options in women's new arrivals before committing to a crew.

3. Why does a crewneck make broad shoulders look wider?

A crewneck sits as an unbroken horizontal ring across the collarbone, and the eye reads that line as the width of your upper body — so it visually extends an already wide frame out to the shoulder seams. The ribbing makes it worse by adding a raised, high-contrast edge.

Two design details decide how much damage a crew does. The first is rib depth: a 1-inch ribbed collar draws a much heavier line than a ½-inch one. The second is the sleeve construction — a raglan seam runs diagonally from the underarm to the neck, which cuts the horizontal and softens the whole effect, while a set-in sleeve reinforces it with a hard vertical stop at each end.

If you love crewnecks and have broad shoulders, buy them in a dark solid, choose a finer gauge, and layer a long pendant or an open jacket over the top to reintroduce a vertical line. A structured jacket worn open over a crew does most of the correcting on its own.

As fashion stylists often note, a sweater's neckline changes your proportions more than its size label does — move the shoulder seam half an inch outward and the entire top half of the body reads wider.

4. When does a V-neck look elongating, and when does it just gape?

A V-neck elongates when it drops at least 3 inches below the collarbone notch and the ribbing lies completely flat against your chest; it gapes when the shoulder seams sit wider than your actual shoulders, which pulls the two sides of the V apart. Depth is your friend, excess width is not.

The gaping problem is almost always a shoulder problem in disguise. When a sweater's shoulder seam hangs past your shoulder bone, the fabric at the neckline has nowhere to go but outward, and the V opens into a sloppy U. People then size down, the body gets tight, and the V still gapes — because the shoulder was the wrong measurement all along.

• 3–5 inches deep: the sweet spot for most frames — enough vertical line to read as elongating, still office-appropriate.
• Under 2 inches deep: behaves like a crewneck, so it offers no slimming benefit on broad shoulders.
• Over 6 inches deep: starts exposing width across the upper chest, which can re-broaden the frame — add a camisole or a fine-knit tee underneath.
• Ribbing that ripples when you stand still: a fit failure, not a styling choice. Ripples only get worse after washing.

Fiber matters here too. A V-neck in a loose, low-recovery blend will stretch open within a few wears; the same cut in a tight-twist merino or a cotton-rich knit holds its shape. Our guide to reading a sweater's fiber label covers which blends keep their structure and which collapse.

5. How tall can a mock neck be if I have a short neck?

If you can fit two fingers or fewer between your jaw and collarbone, cap your mock neck at about 1.5 to 2 inches of unfolded collar height — anything taller closes the visible gap entirely and makes your head look like it's sitting directly on your shoulders. Measure the collar flat, from the seam to the top edge.

The usable rule: the collar should take up no more than half the vertical distance you measured with your fingers. A 2-inch mock on a short neck still leaves a sliver of skin showing, which is what keeps the proportion readable. A folded turtleneck doubles its fabric, so a tag that says "4-inch collar" means roughly 2 inches of visible height — check which number you're looking at.

Short-necked shoppers who want the cozy look of a high collar have better options than a true turtleneck: a funnel neck that stands away from the throat, a loose cowl that drapes downward rather than stacking upward, or a mock worn with hair up to restore visual length. Pair any of them with a long vertical layer from our best sellers to keep the line going.

6. What is the shoulder-seam test I can run in the fitting room?

Put the sweater on, stand square to the mirror, and check whether the shoulder seam lands on the bony point you found in step one — the spot where your shoulder stops and your arm begins. That single checkpoint predicts gaping, widening, and sleeve drag better than any size chart.

Then read the result:

• Seam exactly on the bone: correct for a set-in sleeve. Buy it.
• Seam ½ inch or more past the bone: the sweater is adding width you didn't ask for, and a V-neck will gape. Size down or change styles.
• Seam 1.5–2 inches past the bone on a drop-shoulder design: intentional and fine, as long as the rest of the body is relaxed too. Past 2 inches on broad shoulders, the silhouette goes shapeless.
• Seam pulling inward, short of the bone: too small — expect sleeve-cap pulling and early seam wear.

Raise both arms to shoulder height while you're at it. If the whole sweater lifts off your hips, the armhole is cut too low for your frame, and it will ride up all day. That same seam check works on blouses and jackets, which is why it's worth memorizing before you shop shirts and tops — a structured piece like the Alessia Striped Shirt or the tailored Angela Formal 2-Piece Set shows seam placement far more plainly than a soft knit does.

Running the test before you buy is also the cheapest way to stay out of the returns cycle: Statista data put the U.S. online apparel return rate at roughly 24% in 2023, and neckline-and-shoulder mismatches are a quiet share of that number.

Frequently Asked Questions

What counts as broad shoulders in women's sizing?

A point-to-point back measurement above roughly 16 inches reads as broad in most women's clothing, since standard patterns are drafted around 15 to 15.5 inches. Swimmers, climbers, and naturally wide-framed builds often land at 17 inches or more.

Is a crewneck or a V-neck better for broad shoulders?

A V-neck is better for broad shoulders because its vertical opening interrupts the horizontal line that a crewneck draws across your widest point. If you prefer crewnecks, choose a raglan sleeve and a narrow ½-inch rib to minimize the widening effect.

Can I wear a turtleneck if I have a short neck?

Yes, but keep the folded collar under about 2 inches of visible height and choose a fine gauge rather than a chunky one. A funnel neck or a draped cowl gives the same warmth without stacking fabric vertically under your jaw.

Why does my V-neck sweater gape at the chest?

Gaping usually means the shoulder seams sit wider than your actual shoulders, which pulls the neckline ribbing outward. Check the seam against your shoulder bone before you blame the size — a smaller shoulder width, not a smaller body, is typically the fix.

Does neckline choice matter more than sweater size?

For how a knit reads on your frame, yes. Two sweaters in the same size with different necklines can change your apparent shoulder width by an inch or more visually, while a one-size change mostly affects ease through the body.

What if my shoulders are broad and my torso is short?

Combine a V-neck with a hem that ends at or just below your natural waist, so the vertical opening and the shorter hem work together instead of competing. Our guide to fitting outerwear to an unusual frame applies the same seam logic to coats.

Take your two measurements tonight, then shop the necklines that match at sonverdano.com — knitwear that fits your shoulders, not a generic size chart.