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Flat-lining is sewing your the lining and shell pieces of your project (wrong sides together) before you assemble. You then treat the flat lined piece as one; flat lining allows for a heavier weight to the material which can aid construction. Your question doesn't state whether this is part of the pattern instructions, but I am assuming it calls for flat-lining prior to assembling any of the pieces.

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15y ago

What else can I help you with?