Hello Sam, the standard size (xx/xx/xx) means chest, waist and hip size. Please click the 'Size Chart' under the product photos, there is a size table for our standard size costumes. (n__n)
if you order standard size now (about 2-3 weeks making costume time) and use the free shipping method (Standard Shipping, 20-30 days shipping time), it will reach you around mid-April, before May.
*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. :)