Wrinkles too much

I bought five of these shirts (different colors) and noticed that the shirts were quite badly wrinkled after removing them from the laundry. But I thought that this would simply subside over time as the shirts went into the wash several more times. Well, several months and after many, many washes; these shirts still suffer from wrinkling far more than any other shirt that I own. The shirts themselves are generally average otherwise. One button has come off, but that's not terribly unusual. But the wrinkles would keep me from buying these again. Too bad I bought so many at one time. Lesson learned.