Free Armhole Facing Pattern Generator

Generated example

Armhole facings built from front and back seam lengths

Armhole-matched

This example combines a 22.5 cm front armhole and 23.5 cm back armhole into a 46 cm opening with separate 5 cm deep facing pieces.

Front

The front curve stays distinct

Its length and shape are preserved instead of splitting the total opening into two equal generic halves.

Back

The back completes the opening

Together the two pieces reproduce the measured armhole while keeping shoulder and underarm joins identifiable.

Use transferred values from a sleeveless bodice or dress when possible, then compare the facing sewing edge with the garment armhole before cutting.

Generate armhole facings

Generated front and back armhole facings

Export both pieces as A4 PDF, full-size PDF, or editable SVG.

Related guides

Generator

Basic bodice pattern

Draft a bodice block with neckline, armhole, shoulder, length, and waist shaping.

Generator

Basic dress pattern

Build a connected bodice and skirt draft with waist, darts, length, and hem checks.

Finish

Neck facing pattern

Create front and back neckline facings matched to bodice or dress neckline curves.

Armhole facing guide

Printable facings matched to the armhole seam

The generator drafts separate front and back armhole facing pieces. The inner facing curves are fitted to the front and back armhole seam lengths, while the outer curves create a stable internal finish.

Included

Front and back facings

The export includes front and back facing pieces, inner armhole seam curves, outer facing curves, dashed seam allowance, notches, labels, and a 5 × 5 cm test square.

Measurements

Front and back armhole lengths

Use the finished armhole seam lengths from the garment, not body arm circumference. When started from a basic bodice or dress, these values are filled from the generated geometry.

Construction

Facing width and seam allowance

Facing width controls how deep the internal finish sits inside the garment. Seam allowance is added as a cutting guide around the facing pieces.

Compatibility

Match before cutting

Compare each facing inner curve with the prepared armhole and sew a test sample before cutting final fabric or interfacing.

Printing

A4 tiled PDF, copyshop PDF or SVG

Print at actual size or 100%, disable page scaling, and verify the 5 × 5 cm square before cutting.

Sleeveless armhole finish

Match an armhole facing without changing the opening

An armhole facing must duplicate the finished front and back armhole seam lines while remaining narrow enough to sit inside the garment. Because the opening curves through different grain directions, accurate measurement, stabilization, clipping and understitching matter more than adding extra ease.

Front and back

Keep the two armhole portions identifiable

Front and back armholes are not interchangeable: the front is usually more hollow and the back supports the shoulder blade. Measure each seam line separately and preserve shoulder and side-seam endpoints. Label the generated pieces immediately so they cannot be reversed during cutting.

Stability

Prevent the garment opening from growing

Armholes cross bias grain and can stretch during fitting, pressing and edge finishing. Stabilize the garment seam line before comparing it with the facing. A facing matched to an already stretched opening will preserve the distortion rather than correct it.

Width

Map the inner edge around the whole opening

Facing depth must clear bust darts, princess seams and neckline facings while remaining wide enough not to flip. Check the inner curve on the bodice pattern at underarm and shoulder, where space can narrow quickly. Combine facings deliberately if neck and armhole pieces overlap.

Turning

Clip and understitch for a clean edge

After sewing, grade layers and clip the concave allowance at intervals without cutting the stitch line. Understitch toward the facing wherever possible, then press over a curved surface. Pulling the edge flat on the ironing board can stretch it and cause gaping.

Sleeveless opening check

Test one complete armhole in the intended fabric before committing to both sides.

01 Staystitch or stabilize the garment armhole, then walk front and back facing seams against their matching sections.
02 Transfer shoulder and side-seam notches and confirm that left and right facings are cut as mirrored sets.
03 Check facing depth around darts, side seams and shoulder seams and resolve any collision with a neckline facing.
04 Sew, clip, grade, understitch and press a curved sample using the intended interfacing and lining method.
05 Hang the sample to confirm that the facing stays inside and the finished armhole does not gape or pull.

From pattern to look

Plan the finished garment

Before you cut fabric, browse shirt ideas in Nastix Design and decide which silhouette and details you want to make.

Browse shirt ideas in Nastix Design

How and when

Generated from application code

This generator converts the entered measurements into vector geometry. Where a construction has related seams, the software can calculate their lengths; preview, SVG, copyshop PDF, and tiled A4 PDF are produced from the same geometry. These software checks do not replace printing, sewing, or fitting a test sample.

Last recorded review of the generator implementation and documentation: 2026-07-13. The output has not been certified through physical production testing; verify measurements, print scale, seam relationships, fabric behaviour, and fit for your project.

Read the methodology About the project

Common questions

Armhole facing pattern FAQ

Is an armhole facing different from bias binding?

Yes. A facing is a shaped internal piece that follows the armhole curve, while bias binding is a narrow strip used to bind the edge.

Should I use body arm circumference?

No. Use the finished garment armhole seam length. The generator uses separate front and back lengths so each section matches the garment curve.

Can I start from a bodice or dress?

Yes. Basic bodice and dress geometry can pass the calculated front and back armhole lengths into this generator.

What facing width should I use?

A standard 4–6 cm facing is suitable for many woven sleeveless garments. Use narrower for lightweight styles and deeper when the armhole needs more stability.

How should I print the A4 armhole facing?

Print at actual size or 100%, disable fit-to-page scaling, and check the 5 × 5 cm test square before cutting fabric.

Workflow

01

Use the armhole

Start from the finished front and back armhole lengths, either manually or from a generated bodice or dress.

02

Choose facing width

Select standard, narrow, or deeper facing width and seam allowance.

03

Export for print

Download SVG, copyshop PDF, or tiled A4 PDF with test square and construction marks.

Create an armhole facing pattern from your armhole