Important — alternative approach
If you do not have access to this type of interfacing, you can use your standard interfacing instead.
In this case, follow the conventional method:
– the interfacing extends into the seam allowances
– all steps related to keeping interfacing out of the seams can be skipped
This specific method described in this tutorial works only with woven cotton interfacing.
Nonwoven or synthetic interfacings will not behave the same way:
– edges will not press as cleanly
– the shape will be less defined
For this reason, use the standard construction method when working with those materials.
What this method is
This pattern uses a specific interfacing method, where the interfacing is cut separately and does not extend into the seam allowances.
The interfacing is applied only to the visible areas of the garment, while the seam allowances remain free of interfacing.
This approach is commonly used in shirtmaking and allows for cleaner construction and more controlled shaping.
Method background
This method is widely used in classic shirtmaking, especially in men’s shirts.
It follows traditional tailoring principles, where the interfacing is treated as a separate structural layer rather than being fully integrated into the seams.
There are both non-fusible and fusible versions of this approach.
In this pattern, a fusible version is used, adapted to achieve a clean and controlled result while maintaining the same construction logic.
Type of interfacing
The recommended interfacing is a fusible, 100% cotton woven Interlining designed for shirts, collars, and cuffs.
This type of interfacing is often referred to as:
– shirt interfacing
– collar and cuff interfacing
– woven fusible interfacing (100% cotton)
It is important that the interfacing is woven, not nonwoven.
Weight and examples
Recommended weight for this garment:
– 60–95 g/m² for womenswear
The weight of the interfacing should be selected according to the weight of the main fabric. For very lightweight fabrics, choose a lighter interfacing (around 60 g/m²). For stable shirting fabrics, a heavier interfacing (closer to 80–90 g/m²) can be used. A heavier interfacing is easier to press along folds and creates a more defined, structured shape. A lighter interfacing results in a softer form and may be slightly more difficult to control during construction.
Suitable examples:
- Kufner Cotton iron-on interfacing
- Vlieseline G700
- Vefix Cotton Fusible Interfacing
- Pellon SF101
These are woven cotton interfacings with a continuous adhesive coating.
This type of interfacing can often be found online on platforms such as Amazon, Etsy, and other fabric retailers. Availability may vary depending on your location. Check the composition and weight before purchasing.
Key characteristics
The most important selection criteria are:
– 100% cotton composition
– stable woven structure
– ability to hold shape after fusing
The interfacing must press cleanly along folds and edges without creating bulk.
Adhesive type (important)
In traditional shirtmaking, especially in production, woven cotton interfacing is typically used with a continuous (full-surface) adhesive coating rather than a dot (resin) application.
If you are able to find a 100% cotton interfacing with a continuous adhesive coating, you are on the right track.
This type of interfacing provides a cleaner, more stable result and allows the edges to be pressed with greater precision.
If only woven cotton interfacing with a dot adhesive coating is available in your location, it can still be used.
However, the result may be slightly less sharp and controlled compared to a full-surface adhesive.
Fusing method
Interfacing with a continuous adhesive coating should be fused using:
– firm pressure
– sufficient time
– a stable, hard surface
Avoid excessive steam during fusing, as it may affect the adhesive and reduce control.
The goal is to activate the adhesive evenly and ensure a clean bond without distortion.
If you cannot find this interfacing
If this type of interfacing is not available, choose the closest alternative:
– lightweight woven cotton interfacing
– stable and not too soft
– suitable for collars and cuffs
Avoid:
– synthetic interfacings
– nonwoven (paper-like) interfacings
– very soft or unstable materials
These will not behave correctly with this method.
Why this method works
Because the interfacing does not enter the seam allowances:
– seams remain thin and flexible
– edges are cleaner and more precise
– bulk is significantly reduced
This allows for sharper corners, better turn of cloth, and a more refined overall result.
Pre-shrinking the interfacing
All materials, including interfacing, should be pre-treated before use.
For interfacing, this step is essential to prevent shrinkage after fusing.
To prepare the interfacing:
– soak the interfacing in warm water for 20 min
– do not rub or wring the fabric
– allow excess water to drain naturally
– lay it flat or hang it to dry without applying heat
Do not use an iron while the interfacing is wet.
Once fully dry, lightly press it at a low temperature if needed.
After this process, the interfacing is ready for use.
Interfacing pattern pieces
In this pattern, interfacing is provided as separate pattern pieces.
These pieces do not include seam allowances.
The interfacing pieces are used for:
– front placket (cut 2)
– collar (cut 1)
– collar stand (cut 1)
– cuffs (cut 2)
– sleeve placket (cut 2)
How to use the interfacing pieces
Ater pre-shrinking cut the interfacing pieces following their exact shape, without adding seam allowances.
Place the interfacing onto the fabric with the adhesive side facing down and fuse it in position.
The interfacing defines the final visible area of the piece.
Only after fusing the interfacing, add seam allowances around it and cut the fabric piece.
This ensures that the interfacing remains outside the seam allowances and allows for a clean, controlled construction.
Stitching relative to interfacing
In this method, the interfacing is used as a reference line for stitching.
There are two ways to position the stitching line, depending on the instruction.
Stitching along the interfacing
When the instruction says to stitch “along the interfacing” or “using the interfacing as a guide”:
– follow the interfacing edge as your reference
– place the stitching line very close to it
– keep a minimal offset (approximately 0.5 mm)
This small distance allows the fabric to turn correctly after sewing.
Do not stitch directly on the interfacing edge.
Stitching with offset (turn of cloth)
When the instruction specifies a distance (for example 2–3 mm):
– use the interfacing edge as your reference
– position the needle 2–3 mm away from it
This creates the turn of cloth and allows the outer layer to roll over the edge.
This method is used in areas such as the collar and cuffs, where a controlled edge is required.
Key principle
The interfacing defines the final visible shape of the piece.
The stitching line is always positioned relative to the interfacing — not to the cut edges.
Fixing the interfacing
Because the interfacing does not extend into the seam allowances, it must be secured in place.
This is a required step of the method.
The interfacing must always be fixed by one of the following:
– topstitching along the edges (approximately 2 mm from the edge)
– hand stitching (such as prick stitch or blind hand stitching)
The purpose of this fixation is to prevent the interfacing from shifting and to stabilize the shape of the garment.
Without this step, the structure will not hold its intended form.
Where interfacing enters the seam
In this method, the interfacing is intentionally kept out of the seam allowances.
There is only one exception.
The interfacing enters the seam at the collar, specifically at the seam where the collar is attached to the collar stand.
This is the only area where the interfacing extends into the seam.
This is done to support the collar roll and allow the collar to form a clean, controlled bend without collapsing or breaking at the fold.
In all other areas of the garment, the interfacing must remain outside the seam allowances.
Do not extend the interfacing into seams elsewhere, as this will add bulk and interfere with the construction method.