Ironing drastically reduces the working life of cotton garments.
a. Don't wear them on Parade,
b. Wear un-ironed cotton and take the extra duties.
On the basis of trial and error (I loved Trousers OG, in the 70s - various adjutants disagreed) I think option (a) is best - if you want a peaceful - if slightly sweaty - life.
Option (b) is good only if you do not want to be CO, or if you really like a fight.
On operations, however, if wrinkly ripstop is a source of regimental angst - for heaven's sake . . . after all - if someone's trying to kill you, and all your mates, only the most anally retentive C.O. is going to check you for creases.