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The finished dimensions were 21" length, 14" width and the height from the top to the bottom of the curved sides 6.25". I left the straps at 95" and they wrap around and tie in a rather big bow so you could make them a little shorter. I was working with a scrap of fabric less than a full yard. If I had had more I might have increased the width a little so the apron will be usable for a few years. Add seam allowances to all these dimensions.
Perfect Instructable. I made this today for my 2-year-old granddaughter and reduced the dimensions a little.