Drafting the Back Neckline and Shoulder Slope

Welcome to your first lesson in drafting the pattern for your V-neck top! It’s exciting to begin translating your design idea into a physical pattern. In our previous course, you established the core rectangular framework for your bodice block. Today, we'll start shaping that rectangle into a form that follows the contours of the body.

This lesson focuses on the upper back portion of the bodice. You will learn to plot and draw two critical features: the back neckline curve and the back shoulder slope. These lines act as foundational anchors for the entire upper garment, establishing the fit across your neck and shoulders. Getting them right is the first major step toward creating a well-fitting, custom garment.

From Framework to Form

Before we begin, please have your tools ready: the large paper with your drafted bodice framework, your personal measurement list, a sharp pencil, a long ruler, and a French curve ruler.

Pattern drafting is much like creating a schematic or blueprint in industrial design. We are systematically plotting points and connecting them to create a 2D representation of a 3D object—in this case, your torso. We'll start with the back bodice, which is generally simpler than the front and provides a solid foundation.

Drafting the Back Neckline

The back neckline is a shallow curve that runs from the center back of your neck to the beginning of your shoulder. Its width is based on your neck circumference, while its depth is typically a small, standard measurement to ensure the garment sits correctly without riding up or feeling restrictive.

The video below from the Creative Bobbin channel provides an excellent, clear demonstration of calculating and drawing the back neck curve and the subsequent shoulder line. We'll watch it in two parts.

Now, apply these steps to your own pattern draft:

1. Mark the Neck Drop: On your Center Back line, measure down 1.5 cm from the top corner. This is your neck drop point.
2. Calculate and Mark Neck Width: Use the formula from the video: (Your Neck Circumference / 5) - 0.5 cm. Mark this distance horizontally along the top edge of your block, starting from the Center Back.
3. Draw the Curve: Using your French curve, draw a shallow, smooth curve connecting the neck drop point on the Center Back to the neck width point you just marked.

Drafting the Back Shoulder Slope

Next, we will define the shoulder. Human shoulders are not horizontal; they slope downwards from the neck to the arm. Capturing this angle correctly is essential for preventing strain or bagginess in the finished garment. We will also incorporate a small dart into the shoulder. This dart adds subtle shaping to accommodate the curve of your shoulder blades, much like the darts you've sewn before to shape a flat piece of fabric around the bust or waist.

Let's return to the Creative Bobbin video to see how this is done.

Let's break down that process for your own draft:

1. Establish the Shoulder Slope Guideline: The video provides a formula to approximate the slope: (Your Armhole Depth / 5) + 0.5 cm. Measure this distance down from the top line of your back block and draw a faint horizontal line. This is your guide.
2. Draw the Shoulder Line:
   • Take your shoulder length measurement and add 1 cm for the dart intake.
   • Place the zero-mark of your ruler on the neck point (where your back neckline curve begins).
   • Pivot the ruler downwards until your calculated shoulder length (e.g., 12 cm shoulder + 1 cm dart = 13 cm) intersects with the horizontal shoulder slope guideline you just drew.
   • Draw this line. This is your final shoulder seam line.
3. Draft the Shoulder Dart:
   • Find the halfway point along your new shoulder line and mark it.
   • Draw a 5.5 cm long line perpendicular to the shoulder line, extending downwards.
   • Mark 0.5 cm on either side of the center mark on the shoulder line.
   • Connect these two points to the bottom of the 5.5 cm line to form your dart.

Your back bodice block is now starting to take shape! You have successfully defined the upper boundaries of the garment.

Key Takeaways

In this lesson, you have translated key measurements into the first defining lines of your pattern:

• You calculated and drew the back neckline curve, ensuring it begins at a right angle to the center back for a professional finish.
• You established the back shoulder slope, which dictates how the garment will sit on your shoulders.
• You incorporated a shoulder dart to provide subtle shaping over your shoulder blades.

Next Steps

You've created the "hanger" from which the rest of the back of the top will be drafted. In our next lesson, we will continue building on this by constructing the back armhole curve and drafting the back waist dart. These steps will complete the outline and primary shaping for the back sloper, moving us closer to the final pattern.