How to Sew Darts Properly: A Complete Tutorial

Darts are how flat fabric becomes three-dimensional clothing. They’re folds of fabric stitched to a point, removing excess so the garment curves around a body part — most commonly the bust, the back of the waist, or the hip on trousers and skirts. Without darts, a flat-cut bodice would either fit straight up and down (boxy) or pull awkwardly across the bust (uncomfortable and unflattering).

Sewing a dart looks straightforward — fold along a line, stitch from the wide end to the narrow point. In practice, beginner darts are the most common visible flaw on home-sewn garments. The pointed end puckers, the dart line is uneven, the bust apex doesn’t quite hit where it should. This guide covers what makes a dart look professional vs homemade, with attention to the small details that matter.

What a dart is

A dart is a triangular fold in fabric, stitched to a narrow point, that removes a wedge of fabric from a flat pattern piece. Think of it as taking a small slice out of a circle of fabric — when sewn, the remaining fabric forms a cone shape rather than lying flat.

The two key parts of a dart:

Wide end (dart base): where the dart starts, typically at a seam edge.
Narrow point (dart apex): where the two stitching lines converge to a single point.

A standard bust dart on a fitted bodice, for example, runs from the side seam (wide end) to a point a few centimetres from the bust apex (narrow point).

Types of darts

Single-pointed dart

The most common type. Wide at one end, tapering to a single point. Includes:

Bust darts: from side seam to near the bust apex.
Waist darts: from waistline to near the bust apex (vertical bodice darts).
Back shoulder darts: from neckline to shoulder blade.
Skirt darts: from waistline to hip area.

Double-pointed dart (or “fish-eye” dart)

Wide in the middle, tapering to points at both ends. Used on dresses without waist seams to shape both the bust above and the hip below from a single dart.

These are slightly trickier to sew because both ends need clean transitions, with no seam edge to anchor the dart base.

Contour dart

A double-pointed dart with a curve, used to shape the waist on princess-line dresses without princess seams.

French dart

A diagonal dart from the lower side seam (about 5–10 cm above the waist) up to the bust apex. Common on vintage and couture-style fitted blouses.

Marking a dart accurately

Marking the dart accurately is the foundation. Common marking methods:

Tailor’s tacks

The traditional method. Loops of thread sewn through the dart markings on both pattern and fabric.

Lay the pattern over the fabric. The dart points are typically marked on the pattern with a triangle or with three dots: two for the wide end (dart legs) and one for the narrow point (apex).
Take a needle threaded with a contrasting colour and stitch a loose loop through each dart marking.
Carefully cut between the layers, leaving thread loops in both layers as markers.

Pros: works on any fabric, including dark or pile fabrics where chalk doesn’t show. Permanent until you remove them.

Fabric chalk or chalk pencils

Mark each dart point and the dart legs on the wrong side of the fabric.

Use sharp tailor’s chalk or a chalk pencil.
Mark the dart apex (narrow point) and the two dart legs at the wide end.
Connect the points with a ruler if needed.

Pros: fast, easy to use. Cons: rubs off; not suitable for dark fabrics.

Water-soluble fabric markers

Like chalk but more visible. Wash out with water.

Test on scrap first — some markers can leave permanent marks on certain fabrics, especially silk.

Pins through the pattern

For patterns where you don’t want to mark the fabric: push pins through the pattern at the dart points, then mark the fabric where the pins emerge.

Sewing a single-pointed dart step by step

Standard process for a basic bust dart.

Step 1: Mark all three dart points

Mark the apex and both dart legs on the wrong side of the fabric. Make sure the marks are on the wrong side — sewing the dart on the right side reverses the dart and is the most common beginner mistake.

Step 2: Fold along the dart’s centre line

Fold the fabric so the two dart legs meet. The fold runs through the dart apex.

Step 3: Pin the legs together

Pin perpendicular to the fold, holding the dart legs aligned along the marked line.

Step 4: Sew from the wide end to the narrow point

Start at the dart base and sew along the marked line, tapering toward the apex.

Step 5: Sew off the apex without backstitching

Critical step. The last 1–2 cm of the dart should taper to nothing. Don’t backstitch at the point — the fabric will bunch up and pucker.

Instead:

Reduce stitch length to 1–1.5 mm in the last 2 cm.
Sew right off the fabric edge at the apex (so the last stitch is “in the air” beyond the fabric).
Cut the threads with about 10 cm of tail.
Tie the threads together with a knot close to the fabric.

Some sewers also stitch parallel to the fold (1 mm in) for the last 1 cm before sewing off the edge — this produces a smoother apex.

Step 6: Press the dart

Press the dart flat as sewn first (to set the stitches into the fabric). Then press the dart toward the centre of the garment (or whichever direction the pattern specifies — typically bust darts press downward, waist darts press toward centre front/back).

For more on pressing, see our pressing techniques guide.

Sewing a double-pointed dart

The double-pointed dart needs both ends sewn off cleanly. Two approaches:

Approach 1: Sew from the centre to each end

Start at the widest point in the middle.
Sew toward one apex.
Lift the needle, return to the centre.
Sew toward the other apex.

The two stitching lines meet at the middle.

Approach 2: Stitch from one end through to the other

Start at one apex.
Sew through the wide centre.
Continue to the opposite apex.

Both ends taper to nothing without backstitching.

The double-pointed dart is more demanding because the centre (the widest fold) doesn’t have a seam edge to anchor it. You need to maintain even tension throughout.

Common dart mistakes and fixes

The apex puckers

Causes:

Backstitching at the apex (don’t).
Sewing too thick a dart (try a smaller dart).
Stitching the dart legs from a sharp angle into the apex (taper smoothly).

Fix: re-sew the apex, sewing off the fabric edge with a long thread tail.

The dart is uneven from one side to the other

Cause: the marking was inaccurate, or the fabric shifted during sewing.

Fix: mark more carefully on future projects. For the current project, you may need to unpick and re-mark.

The dart point doesn’t sit at the bust apex

Cause: the pattern wasn’t adjusted for your bust apex position. Or you cut the wrong size.

Fix: adjust future projects with a full bust adjustment and pattern fit modifications.

The dart point is dimpled

Cause: the apex was sewn too sharp (the dart legs converge at too steep an angle).

Fix: redo the dart with a smoother taper. Some patterns specify a slight curve in the dart legs; follow this curve precisely.

The dart shows through to the right side as a ridge

Cause: dart wasn’t pressed properly.

Fix: re-press over a tailor’s ham (a curved pressing tool that follows the curve of the dart). Press from the inside, then again from the outside with a press cloth.

Pressing darts

Darts get pressed differently depending on the dart and fabric:

Press toward centre or away from centre?

Bust darts: typically pressed downward (toward the waist).
Waist darts (bodice): typically pressed toward the centre front or centre back.
Skirt and trouser darts: pressed toward the centre back (vertical darts).
Back shoulder darts: pressed toward the centre back.

The pattern instructions usually specify direction. When unspecified, follow the convention above.

Use a tailor’s ham

A tailor’s ham is a curved cushion that supports the dart’s three-dimensional shape during pressing. Without one, you press the dart flat — distorting the shape it’s trying to create.

If you don’t have a ham, an inexpensive workaround is a small towel rolled tightly. Less ideal but functional.

Heavy fabric darts

For heavy or bulky fabric, slash the dart open after sewing. Cut down the centre fold to within 1 cm of the apex, then press the cut allowance to either side. This eliminates bulk that would otherwise show through to the right side.

When darts go wrong systemically

If darts on every garment you make have the same issue (always pucker, always end short of the bust apex, always seem too tight), the problem is likely with the pattern, not your sewing.

Always pucker: try a finer needle and lower tension.
Always too short for the bust apex: you need a larger pattern size or an FBA.
Always too tight at the bust: the cup size is too small for your body. FBA.

For more on these adjustments, see our body measurements guide.

Closing thought

A well-sewn dart is one of those small details that separates competent sewing from polished sewing. The fabric flows smoothly from the dart point; no pucker; no visible ridge. Achieved through marking carefully, sewing off the fabric edge at the apex, and pressing thoughtfully — none of which is hard once you know the steps, all of which is easy to skip in a rush.

Practice on scrap before sewing darts on the project fabric. The first few darts of each project tend to be the worst; sewing two practice darts on a scrap means the actual garment darts come out of the second-attempt batch instead of the first.

For broader fabric handling and construction context, see our complete beginner’s guide to sewing.