How to sew an adjustable chef's apron

Step 5 Sew on the casing

Take your curved pieces back to the apron and line them up along the armholes, right sides together. Pin in place and sew them down along that inside curve. Fold them open press the seams just a little. It will be curving the wrong way, I know, but you want to flatten that bump out just a little before the next step.