There are different types of seams.
1) French seam: This is a flat seam. It does not show from the right side. All raw edges are completely enclosed. It does not require extra neatening process. It is suitable for children's cloth. To make:
- place wrong sides of fabric pieces together.
- pin and tack along fitting line (seam line).
- remove pins and sew 3-6 mm nearer the edge than seam line, using back-stitch or machine.
- trim the seam allowance carefully.
- remove taking and fold the fabric right sides together.
- roll the seam between fingers and thumbs until stitching is along the edge.
- tack and press into two; sew along seam line and remove tacking and press.
2) Run-and fell seam: This ties flat with two rows of stitching on the right side of the garment. All row edges are enclosed. Thus no extra neating is required. It is strong and durable. To make:
- place wrong sides of fabric together and make a plain seam,
- trim the underneath seam allowance to about 3 mm,
- trim the upper seam allowance to 10 mm,
- fold and press the upper seam allowance over the lower one.
- sew through all layers close to the folded edge and Press.
3) Lapped or Overlaid seam: This is visible on the right side. It is very strong. It is commonly used on curved or pointed seams where stitching from the inside is difficult. It is also used to give decorative effect. To make:
- mark the lapping lines on each piece of fabric.
- turn under the seam allowance on the overlay to the wrong side.
- press and tach into place; prepare the underlay.
- place the overlay right side up in the underlay. Match fitting lines and patterns.
- pin and tack the folded edge of the overlay onto the seam line of the underlay.
- sew 3-6 mm from the fold through all layers.
- trim and neaten the seam allowance on the wrong side.