|How to Trim and Clip Seam Allowances
How to Trim a seam allowance
To trim a seam allowance, cut it to about half its width unless otherwise instructed. For light to
medium weight fabrics, clip both sides of the seam allowance at once. For heavyweight fabrics,
clip each side of the seam allowance separately.
How to Grade a seam allowance
Grading is when the layers of fabric in a seam allowance are trimmed to different widths. It can
help reduce bulk when a seam allowance consists of many layers of fabric or if the fabric is very
bulky. It can prevent a noticeable ridge or bump from showing on the outside once the item is
of fabric slightly wider, and so on. Trim the seam allowance closest to the outside of the
garment the widest.
How to Clip Curves
How to clip inner curves:
the item is turned.
To clip an inner curved seam, clip into the seam allowance at periodic intervals, ending
about 1/8” from the stitching. Clip farther apart for shallower curves, closer together for
How to clip outer curves:
when the item is turned without producing bulk.
To clip an outer curved seam, cut small “V’s” out of the seam allowance at periodic
intervals, ending about 1/8” from the stitching. Clip farther apart for shallower curves,
closer together for deeper curves.
t clip too close to the stitching or it will weaken the seam.
If a curved seam will be subject to stress, such as in a princess seam, stagger the clips
How to Trim Corners
The seam allowances in corners need to be trimmed to reduce bulk in the corner once the item
taper the seam allowances on the sides toward the point of the corner.
even want to add a row of reinforcement stitching or use a very fine stitch at the corner.
|Seam allowances sometimes need to be trimmed
or clipped. This is to reduce bulk so that the seam
allowance lies flat and smooth once the item is
turned. Your pattern instructions should tell you
when to trim or clip a seam allowance.
the task easier.