Pattern is Japanese, but fully charted using standard knitting symbols. Direct link to pattern PDF here.

Materials:

• Japanese size 4 knitting needles (3.3mm)
• 2 buttons (20mm in diameter)
• 250g (593.75m) color A
• 60g (142.5m) color B

Gauge in stockinette is the same as the gauge listed for pattern stitch.

Note: the shirt in the photo can be found here. The yardage in the pattern is not listed separately for the shirt and overalls, so the amount of yarn listed here is for both items.