Hello W. Barbour, if you order it now (about 2-3 weeks making costume time) and use the fastest shipping method (Premium Express, 3-6 days shipping time), it will reach you before 15th September .
When you order, you can write down the sleeves' length (from shoulder to ankle)(in "cm"), our tailor will make the sleeves' length as you requests. (n__n)
*Please remember to mark down the date (you need it) in the order form when you order it. :)