In these diagrams are suggested seam allowances used in industry:
If one traces the patterns as the seams are modified then the original printed pattern is left intact and can be easily referenced. Tracing paper, available at any art supply store, works really well. I buy the 50 yard 36 inch wide yellow canary. White is too opaque.
For a 3/8 inch seam allowance, remove 1/4 inch.
For a 1/2 inch seam allowance, remove 1/8 inch.
Curved seams that have stress, such as princess seams MUST have a seam allowance of 3/8 inch. Curved seams that do NOT have stress such as collars are usually given a seam allowance of 1/4 inch, but if the fabric frays easily use a 3/8 inch seam allowance.
Waistbands are usually given a 3/8 inch seam allowance on the waistband at the waist A waistband must always have at least a 3/8 inch seam allowance at the waist as a 1/4 inch seam allowance is not strong enough to support the skirt. Other seams in the waistband usually are given a 1/4 inch seam allowance, but may have a 3/8 inch seam allowance.
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