Please be as detailed as possible.
For example: "We have a 5k race coming up this fall and need about 500 shirts for all the racers, staff and volunteers. We would like the 400 racer shirts to be light blue and the 100 staff and volunteer shirts to be bright orange. We would like our event design on the front in white and our logo along with our sponsors logos on the back, also in white. We will know the final count and sizing by August 28th."