I usually iron my linen shirts a bit to knock out the hard wrinkles. A good hot iron with proper steam will knock out the soft wrinkles. Also using spray starch or spray sizing helps as well. The more you wash linen the softer it gets, wrinkles less... If your garment can be washed, some items might shrink. I make my own linen shirts so I prewash the fabric to prevent shrinkage.
"You used to be so cool, but now, you know you're so cold"