Steps: 1. Serge the sleeves, the two side seams, and the hemline of the pieces.
2. Underline the top to act as a facing (figure A).
3. Sew the shoulder seams of the fashion fabric and press, then sew the shoulder seams of the underlining and press so that you have two identically-shaped pieces.
4. Stay-stitch the neckline to create some stability on the neckline before creating permanent stitches for the garment (figure B).
5. Join the two layers together by sewing the neck edge (figure C).
6. Clip and press.
7. Machine understitch the underlining.
8. Measure the openings carefully so they're all the same length (four measurements in all), one for each side of the fashion fabric, and one for each side of the underlining. Sew the center back seams separately.
9. Press open the seams, and fold in and press at the opening at the top of the back. Slipstitch those seams shut.
10. Lay all of the layers flat, and carefully align them along the side seams, the armhole and the hem. Baste along the stitching lines of the side seams and armscye, as well as the hem lines.
11. Finish the edges on the serger.
12. On the front of the top, make darts, carefully lining up the layers, and then press them down.
13. Sew the side seams and press open, leaving the slits at the bottom edge.
14. Take the basting out of the side seams, but leave it in around the armholes until the sleeves have been put in.
15. To prepare the sleeve, ease-stitch the top of the sleeve between the marks from the pattern.
16. Stitch the sleeve seam, then press up the hem to the sleeve.