Cut shirt using print pattern pieces; tape together, and cut out. Lay shirt flat, and trace pattern with disappearing-ink pen, following the higher neckline. Cut out; you will have a front and back piece. Trim the front neckline as shown on pattern. Trim the dress length if desired.
Sew dress pieces together: pin front and back pieces together, right sides facing, and sew along shoulders, under arms, and down sides, with a 1/2-inch seam allowance. Notch under the arms. Press seams open with iron. Finish seams with pinking shears or a zigzag stitch to prevent fraying. If you shortened the length, finish the edge with a double hem: Fold the unfinished edge over 1/4 inch. Press, then fold over 1/4 inch, and press again; pin, and edge-stitch.
Finish neckline. Turn dress right side out: fold a 16-inch length of bias tape over neckline; pin, turning under 1/2 inch at each end. Stitch tape 1/8 inch from the edge. To make a tie, cut a 22-inch piece of bias tape. Fold in half, right sides facing, so long edges meet, and stitch with a 1/8-inch seam allowance; use the loop turner to turn it right side out. Cut a slit in bias tape to the left of the button placket; attach a safety pin to the tie, and thread all the way through neckline, starting at the slit you just made.
Finish sleeves: fold an 11-inch length of bias tape around each sleeve opening, turning under 1/2 inch at each end, and pin. Stitch 1/8 inch from the edge, leaving an opening where the tape meets at the base of the sleeve opening. To cinch the sleeves, attach a safety pin to an 11-inch length of elastic and thread through the tape; cinch slightly. Trim elastic so the ends overlap 1/2 inch, and stitch. Hand-sew opening shut.
Men's medium or large button-down shirt
Sewing machine and sewing supplies
Iron 2 yards of 1-inch single-fold bias tape 1/4 yard fabric (for ties)