What is a dress which has seam on your backside called? : r

Help please! What is this part of the garment called (circled)? Sometimes it appears flat, other times it almost looks like a bustle, but at the waist. Thanks in advance! : r/fashionhistory

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What is a dress which has seam on your backside called? : r/femalefashion

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What is this seam called? : r/SewingForBeginners

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