This shows trimming the edge for the next seam. It aligns with the previous piece. Press with a dry iron before trimming.
The procedure is the same for pieces three and four.
trim to align edges
[ATTACH=CONFIG]5817[/ATTACH]
sew on the lines! (Add piece 3)
[ATTACH=CONFIG]5818[/ATTACH]
trimming piece 3 - strips for #4 waiting...
[ATTACH=CONFIG]5819[/ATTACH]