fabric - about 1/2 yard
Width - measure around the chest of your dress wearer and add 1" for seam allowance (1/2" on either side, you can use less if you'd like)
Length - measure from where you would like the top of your dress to be down to your desired length, then add 2" for seam allowance
For this dress I measured Sophie from the base of her neck down to her calf which was 24" (+2") equals 26" total length, her chest is 19" (+1") equals 20" total width
At the top of the piece, I marked 2.5 inches from each side. I then marked 6 inches from the top down and cut the J shape of the arm holes using those markings as a guide. I hope I explained that clearly!
Okay, now that the piece is cut, it's on to the sewing part (my fav)!
First create the bottom hem of the dress
Take raw edge and fold under original fold a 1/4" and press in place, then sew with an 1/8" seam allowance
With right side of fabric face up, pin your ribbon (right side up, if patterned) to the bottom of your piece. Line up the edge of your dress with the edge of the ribbon, I let mine hang over just the slightest bit in case it moved while sewing.