Lace loops than on an adult.
I recommend Satin Fabric for Bo Peep original dress. For Bo Peep Blue Jumper I recommend matching the blue fabric you're using for the jumper/undergarments like Petal Signature Cotton or Lightweight Till. Or go for a higher texture fabric to simulate ageing of the pattern like Dogwood Denim, Eco Canvas, or Cypress Cotton Canvas. A Fat Quater is all you will need for a front panel.