How a Dress Should Fit.
How a dress should fit at the shoulders, bust, waist seam, hips and hem, and how fit changes for wrap, sheath, A-line, shift and slip dresses.
Right size: the shoulder seams sit on the edge of the shoulder, the neckline lies flat, the fabric is smooth over the bust and hips, and the tie sits at the natural waist.
The fit in 30 seconds.
Check these in order. The first ones are the hardest to alter.
- 01
Shoulders and straps
On a dress with sleeves, the shoulder seam ends at the edge of your shoulder bone. On a strappy dress, the straps lie flat and stay put without digging in.
Test: Shoulder seam within 1 cm (about 3/8 inch) of the shoulder bone; shrug once and the straps should not slide off.
- 02
Bust
The bodice lies smooth across the bust with no pulling between or under it, and the bust darts point at the fullest part of the bust.
Test: No horizontal pull lines across the bust; dart tips stop 2 to 3 cm (about 1 inch) short of the fullest point.
- 03
Armholes and neckline
The armholes sit close without cutting in, and the neckline lies flat against your chest when you lean forward.
Test: Armhole about 2 to 3 cm (1 inch) below the armpit, no bra band visible from the side; lean forward and the neckline stays flat.
- 04
Waist seam
A waist seam sits at your natural waist, the narrowest point of your torso, unless the style puts it elsewhere: just under the bust on an empire dress, at the high hip on a drop waist.
Test: Bend sideways: the seam sits in the crease that forms, within 1 to 2 cm (about 1/2 to 3/4 inch).
- 05
Hips
The skirt falls straight from the fullest part of your hips. Side seams hang vertically and the fabric does not cup under your seat.
Test: On a sheath, you can pinch 2.5 to 5 cm (1 to 2 inches) of fabric in total at the hips; on an A-line, the skirt does not touch the widest part of the hips.
- 06
Zip
The zip closes without you holding your breath, and the seam around it lies flat.
Test: One smooth pull to close; no ripples, bubbles or visible zip teeth along the seam when you stand and sit.
- 07
Hem
The hem lands at a deliberate point for the style and is level all the way around.
Test: Knee length: top of the kneecap to 2 to 3 cm (1 inch) below it. Midi: between just below the knee and mid-calf. Check in a side view that the back is not shorter than the front.
A dress fits when the shoulders and bust are right, the waist seam lands where the pattern put it, and the skirt hangs straight from your hips. Buy for the shoulders and bust. A tailor can change most of what sits below.
Test it in under a minute
Close the zip all the way first. A half-closed zip hides every problem.
Reach both arms forward as if hugging someone. The back should not pull tight across your shoulder blades and the armholes should not cut in. Raise your arms overhead and lower them: the waist seam should settle back at your waist.
Sit down. A fitted skirt rides up, but it should not pull into lines across your thighs. Lean forward: the neckline should stay against your chest. Then turn sideways. Too big leaves a fold of fabric at the small of your back. Too small shows the outline of the zip.
Buy for the shoulders and bust
The shoulders, armholes and bust are cut as one shape. Narrowing the shoulders on a sleeved dress means taking out and resetting both sleeves, and ready-to-wear seams rarely hold more than 1 to 2 cm (under an inch) to let out. So choose the size that fits your shoulders and the fullest part of your bust, then have the rest taken in.
Look at the bust darts. The tips should point at the fullest part of your bust and stop about 2 to 3 cm (1 inch) short of it. Darts that end too high or too low leave a pointed bubble of fabric, and moving them is real work.
Leave the hem, strap length, side seams and a rippling zip to a tailor. Princess seams, the long curved seams running over the bust, make a dress easier to alter because bust, waist and hip can be adjusted separately along them.
What "right" means for each silhouette
Sheath. Fitted from bust to knee, it is the least forgiving shape. Right means smooth over the stomach and hips with 2.5 to 5 cm (1 to 2 inches) of ease you can pinch at the hips, and no fabric cupping under your seat.
A-line. Only the bodice and waist need to fit. The skirt should flare away from your hips without touching their widest point. If the flare collapses against your hips, the dress is too small even though the zip closes.
Wrap. The crossover should lie flat over the bust when you lean forward, and the tie should land at your natural waist. Gaping there means the bodice is cut for a different bust than yours; a small snap fixes a slight gap.
Shift. No waist seam, so it hangs from the shoulders and bust. It should skim the hips with a few centimeters to spare and not cling at the stomach. Sagging armholes mean it is too big.
Slip. Cut on the bias and hung from straps, it follows your body. Set the straps so the neckline sits where it was designed to. Too small, it twists and shows every line underneath. Too big, it slides and the neckline gapes.
An oversized shirt dress or smock is drafted with dropped shoulders and extra volume, but its neckline still sits right and its armholes are cut for the drop. A dress that is simply too big gapes at the neckline and armholes, and its waist seam lands low.
When standard sizing does not fit you
Larger bust. Size for the bust and take in the waist and hips. Wrap dresses, stretch knits, princess seams and cup-sized ranges save alterations.
Smaller bust, wider hips. An A-line or fit-and-flare lets you fit the bodice and gives the hips room. In a sheath, buy for the hips and take in the bodice.
Petite. Under about 160 cm (5 ft 3 in), standard dresses put the waist seam and darts low and the hem long. A hem is a cheap fix; a waist seam is not, so try petite ranges.
Tall. The waist seam sits high and the hem short, and most hems hold only 2 to 4 cm (1 to 1.5 inches) to let down. Tall ranges help, as do shapes without a waist seam: shift, slip and wrap.
Stomach. A sheath shows everything; an empire seam or a wrap gives room. Lines pulling across the stomach mean size up and take in elsewhere.
Broad shoulders. Sleeveless, halter and strap styles avoid the shoulder seam entirely.
Vanity sizing makes one brand's 8 another's 6 or 10, so go by your bust, waist and hip measurements and the garment chart.
Related guides
See how a blazer should fit and how a trench coat should fit. Before paying for an alteration, check whether a tailor can fix it or upload a mirror photo to fit check.
Can a tailor fix it?
The dress is too long.
The hem is cut for a taller body than yours.
What to do: Have it hemmed. Lined, layered, chiffon and bias-cut skirts cost more because each layer is hemmed separately and bias fabric has to hang before it is marked.
Straps slip off or the neckline sits too low.
The straps are too long for your torso.
What to do: Ask to shorten the straps at the back so the neckline lifts.
Loose at the waist or hips, fits at the bust.
Your bust-to-waist or bust-to-hip difference is larger than the pattern assumes.
What to do: Have the side seams, princess seams or darts taken in. A side zip or a lining adds to the cost.
Fabric pulls across the bust or hips.
The dress is too small for your largest measurement.
What to do: Return it and buy the size that fits your bust or hips, whichever is larger, then take in the rest. Ready-to-wear seams rarely have more than 1 to 2 cm (under an inch) to let out in total.
The waist seam sits below your waist.
The bodice is too long for your torso, common on petite frames.
What to do: A tailor can unpick the waist seam, shorten the bodice and reset the zip. A waist seam that sits too high cannot be lowered.
The neckline or armholes gape.
The bodice is too big above the bust, or the dress is cut for a different cup size.
What to do: Small gaps can be closed by taking in at the shoulder seams or adding a dart. On a sleeved dress this means removing the sleeve, so it is often not worth it.
Shoulder seams hang past your shoulders.
The dress is cut for broader shoulders than yours.
What to do: Return it. Narrowing the shoulders on a sleeved dress means rebuilding both armholes. On a sleeveless dress, a tailor can take in the shoulder seams more cheaply.
The zip ripples or bubbles.
The dress is tight at that point, or the zip was sewn in with the fabric stretched.
What to do: If the dress fits, have the zip replaced or re-sewn. If it is tight, the ripples are a sizing problem.
Prices are typical ranges at an independent tailor in the US and vary by city. Check another garment →
Asked often.
- Should I buy a dress to fit my bust or my hips?
- Buy for whichever is larger, then have the other taken in, because taking in is cheap and letting out is rarely possible. On an A-line, wrap or fit-and-flare dress, fit the bust and shoulders; the skirt has room for the hips.
- Where should the waist seam of a dress sit?
- At your natural waist, the narrowest part of your torso and the point where you crease when you bend sideways. Empire dresses put it just under the bust and drop-waist dresses at the high hip.
- How long should a dress be?
- A knee-length dress ends between the top of the kneecap and about 2 to 3 cm (1 inch) below it. A midi ends between just below the knee and mid-calf. Whatever the length, the hem should look level from the side.
- Can a tailor shorten a dress with a slit or a lining?
- Yes. The lining is hemmed separately, which costs more. The slit gets shorter by the same amount unless the tailor also opens it higher.
- Why does my dress size change between brands?
- There is no binding size standard, and many brands label larger garments with smaller numbers. Check the garment measurement chart against your bust, waist and hip measurements instead of the size on the label.
