Hello, thank you for your inquiry. Based on the measurements you have provided, we would recommend that you select a size Large in our Basketweave Oxford. Your little gent is just about on the cusp of being an Extra Large, so if you would prefer him to grow into the garment you might consider sizing up. Children do grow fast, so a Large might not fit him for very long.

As always, you may return or exchange within 90 days if you are not pleased with the fit. Best of luck.

Kind regards,
Brooks Brothers