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I put it a bit higer than the start of the cut in the skirt. I began to sew at the level of this cut. Then I wanted to attach the other side and to solve the pike afterwards.
You can take a look at how it ended up.
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I didn't pin it or mark somehow and I managed to sew the other side higher than the first one. I still have a lot to learn:-D
I don't like this type of gores... grrr