I have three crinkle boy shirts - blackwatch plaid, red check, and black/white check. Ironed them all, then literally watched them "re-crinkle".HA! ;)
Maybe that's a selling point . . . "retains crinkly / wrinkly texture despite washing, drying, ironing, stretching, bending, cajoling, persuading, bribing, strong arguments, kind words, and general wishing."