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Darts in Seams

A dart does not always need to end as a stitched triangular fold within the body of a pattern piece. By separating a pattern into multiple panels, dart intake can be absorbed directly into structural design lines and style seams without altering the garment's fit or bust contouring.

The Principle of Seam Absorption​

When a design seam passes directly through the bust apex, the entire dart intake can be incorporated into the seam itself. The seamline divides the pattern into distinct sections, allowing the original dart volume to be eliminated while shaping the fabric through the curved edges of the adjoining panels.

Common applications include:

  • Classic Princess Seams: Extending style lines from the armhole or shoulder down through the apex to the waistline or hem.
  • Horizontal and Curved Yokes: Running seamlines across the chest through the apex to absorb vertical shoulder or neck dart intake.
  • Diagonal or Asymmetrical Seam Lines: Creating geometric panels across the bodice where seam intersections meet at the bust point.

Step-by-Step Panel Separation​

  1. Establish the Design Line: Draw the desired style seam across the pattern, ensuring that it intersects directly through the bust apex.
New Seam Drawn in Red (click to expand)
  1. Slash Along the Seam: Cut the pattern completely apart along the newly drawn design line to separate the bodice into distinct panels (such as Center Front and Side Front).
  2. Close the Original Dart: Pivot and close the original dart legs on the appropriate panel until they meet and touch. This action automatically transfers the shaping into the cut edges of the style seam.
Waist Dart Closed (click to expand)
  1. True the Adjoining Seams: Smooth and blend any sharp angles along the new panel edges to create continuous, matching seam lengths.
Final Pattern Pieces (click to expand)
  1. Add Alignment Notches: Place matching registration notches along both cut edges near the apex to ensure accurate alignment during assembly.
Sewn Yoke Pattern

Sewn Yoke Pattern

Off-Apex Seamlines​

If a desired design line bypasses the apex rather than intersecting it directly, the dart intake cannot be fully absorbed into the cut seam. In these designs, the remaining portion of the intake must either be retained as a secondary dart, transferred into gather fullness, or ease-stitched along the seamline to maintain the proper dimensional fit over the bust.

Using PatternMaker Pro​

The Move Dart tool is used to transfer 100% of the waist dart intake to the slash point on the side seam. The Remove Dart tool tool is then applied to the new dart, leaving the pattern ready to be separated into two pieces and have seam allowances added.

Quick Review​

✏️ Question #1: What must occur for a structural style seam to completely absorb a bodice dart's intake?

✏️ Question #2: What happens when a pattern is slashed and separated along a style line passing through the apex and the original dart is closed?

✏️ Question #3: How is remaining dart volume handled if a style seam passes near, but does not directly intersect, the bust apex?