Fold, wrinkle, crumple. (Merriam – Webster)
To make something become creased (=not smooth) or untidy. (Cambridge Dictionary)
If you rumple someone’s hair, you move your hand backwards and forwards through it as your way of showing affection to them. (Collins Dictionary)
Give a creased, ruffled, or dishevelled appearance to. (Oxford Dictionaries)
Antarctic ice rises and rumples: Their properties and significance for ice-sheet dynamics and evolution.
Is a little shoulder rumple acceptable in a soft jacket? | Styleforum