I've finished sewing Ella's dress.
When I got to one of the final steps- (attaching the bodice to the skirt), I asked mom to come over to help me to make sure I did it right (I'd already done it wrong once and had to rip it all out). When she was over, she asked what the seam allowance was. My response: "Seam allowance?!"
Despite the fact that I did not know what a seam allowance was, nor did I use the proper one, the dress turned out just fine and Ella has actually worn it! :)