Crinkles are a result of the batting shrinking more than the top fabric. So first, prewash the top fabric and dry in dryer to get the most shrinkage before it's pieced and quilted. Then get batting with the most shrinkage percentage. The % shrinkage is listed on the label of the batting.
http://battylady.com/batting_information.php This link has information on many of the batts. Go to the list of batts, then open the box of specifics on each batt.