"The Lucy" - Open Back A-line Dress Sewing Pattern- Mummykins and Me by Rebecca Page. PDF sewing pattern, girls toddlers. This open back a-line dress sewing pattern will give you an adorable little dress for your girl or toddler sizes 2-12 years. A very simple, easy to sew pattern. The back is open so it needs to be worn over a diaper cover, bloomers or shorts. It ties at the back with fabric ties and has ruffles along the centre back seams and hem. It is fully reversible.