Sew on buttons evenly spaced along buttonband.
Just push buttons through buttonband fabric for self made buttonholes.

FINISHING:
Once done, seam all mitered corners.
Weave in all ends.

Note: This is an easy pattern but a mistake will be very noticeable. Rather than strictly following the printed pattern (which will work), try reading your knitting.  Here are some hints:

Separate for the sleeve sts: You may wish to work the sleeves on a separate needle for ease of knitting- a straight set of the larger needles will do.
Knit across front sts, knit across the next 44 (50, 52, 54, 56) sts for sleeve. Work back and forth on the sleeve sts only as follows:
Decrease 1 stitch at each end of every 4th row until there are 30 (32, 34, 36, 38) sts.
Work in stst on the sleeve sts until total length from underarm is 7 (8, 9, 10, 11)”, ending with a purl row.