Title says it all. I have some nice dress shirts that I've recently acquired. I wash them in a cold-to-warm gentle cycle in the machine and tumble dry low. I'm worried that the collars will lose their shape and stiffness after a few cycles. Should I be washing my shirts like this? How do I iron the collar? Does ironing the collar alone keep it stiff, or do I need to get it starched and get collar stays? I'm completely clueless.