The physical seam allowance in a pattern piece in an imported DXF file is shown by an internal line. To remove this seam allowance, we do the following:
Select an edge.
Apply a negative seam allowance - equal to the amount of the existing seam allowance material.
Delete the internal line.
For example, if there’s 1cm seam allowance on an edge, we apply a seam allowance of -1cm.
We are going to apply this technique to our pattern pieces, starting with the collar, then the sleeves, and then the front and back pieces.
Once you are ready, continue with Dealing With the Collar.