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When sewing with netting, you can see the fabric below which is marked with lines to follow. Sewn-thru requires you to sew two large pieces of fabric without being able to see the underlying layer. Add to that the slipperiness of nylon and interesting (but unwanted) things begin to happen.
I just use a lighter colored fabric when possible which provides the see through effect. If you have darker fabric, use a silver sharpie so it shows up when looking through.