Even if you have ironed correctly a chemise, if you do not fold appropriately, at time of dressing, ironing will be useless. It is not difficult.
With a bit more of practise and some appropriated advice; you will not have any problem to dress it perfectly.
Nevertheless, remember your chemise will be perfect if after ironing, you put on a hanger and fast the first bottom.

1) After ironing the chemise, leave being cold, fast and put front in down.

2) Fold one of half according with desiderated size.

3) After that fold cuff down.

4) Fold the other half, checking the pleat is in straight angle from shoulder to down.

5) Fold second sleeve. It has to be in straight angle and not strait to down.

6) Fold inferior part of chemise´s collar over both cuffs. Fold chemise in way folded body over cuffs until the collar.