How to Keep Your Shirt Collar Crisp Without an Iron
1) Use water to dampen the collar around the fold.
2) Take a hair straightener (plugged in and warmed up, but not too hot) and pinch the shirt collar in between the hot plates.
3) Straighten out the creases within the collar by using a smooth back and forth motion with the hair straightener.
4) To maintain crispness, insert collar stays (remove before washing and dry-cleaning).