Hello Brenda, if you order it now, we are so sorry that it is unable to reach you within 3 weeks.
*If you order standard size now (about 3 weeks making costume time) and use the fastest shipping method (Premium Express, 3-6 days shipping time), it will reach you around 4 weeks after order's paid and confirmed. (n__n)
*All shipping information (including methods, cost & estimated delivered date) will be shown in order page, before payment; you can pay extra cost to upgrade shipping method there.
*Please remember to mark down the date (you need it) in the order form when you order it. :)