All of the patterns are sized for a 2-year-old. You may need to patch together towels before cutting the pieces, or supplement with linen yardage (vintage or store-bought).
Bias tape, by Wright’s, from $2 for 4 yd., joann.com
Download dress pattern template, print, and assemble pattern. Lay out on towels (you may need to play around with positioning) and cut out.
With right sides facing, sew back pieces together, leaving 3 inches unsewn at neck. Press seam open. Cut a 6-inch piece of bias tape; sew on.
With right sides facing, sew seams at shoulders and sides. Press seams open.
Cut tape to fit around one armhole; sew on. Repeat on other side.
Cut tape to fit around neck, adding 12 inches on each end to create tie closure. Sew on. (Or cut tape to fit neck opening, sew on, and add a button and thread-loop buttonhole.)
Optional: Add ruffle. Baste along one long edge. Pull ends of thread to gather. With right sides facing, sew gathered edge to bottom of dress. Press seam open.
Press hem under by 1/4 inch, then another 1/4 inch. Sew.