I iron alot, so let me give you some tips.
1. If he really likes starch, buy the liquid starch and put it in with the rinse cycle. I also really like the dry starch, I cook it with water on the stove (follow the package directions) then put it in the rinse cycle with warm water. (Actually, most rinse cycles are now cold only, so I turn it to the wash cycle to fill, let it agitate with the starch, then let it spin out, stopping before the rinse cycle.) You can do really heavy starch, or fairly light starch. My local grocery ordered a full case for me -- about 20 boxes. They last me about 2 years.
2. Hang them until they are about half dry, then iron them dry. If you don't have time to iron them immediately, roll them up and put them in a plastic sack (like a Wal-Mart sack) and put them in the refrigerator until you have time to iron. I hate to admit this, but sometimes when I really get behind I have put them into the freezer, so the damp clothes won't sour in my refrigerator.
3. Setting the creases. If you can see a natural crease, then follow it. It will show if you try to change it. If not, match the leg seams and make a crease. You'll need to press one leg at a time, both top and bottom. Ask if he likes the creases to go clear up to his waist (mainly in the back) or if he wants them to end at his leg/hip joint.
4. Iron until the fabric is dry -- I like to get books on tape or CD and listen while I iron. It makes the time go faster. Our public library has great choices -- check out yours.
5. Hang the up and let them cool/dry/set overnight. Don't iron, then put on, they haven't cooled and set up yet. You'll be far happier with the product.
6. If you just cannot give up that spray starch, then spray the starch on, let it soak in a few minutes, then iron. Those white marks are dried spray starch. I have a few t-shirts that I spray starch, I spray them all, roll them up in a plastic sack, then iron them one at a time.
Best wishes, and pay attention to the brands that are easier to iron. Some kakhis are miserable to iron, some aren't so hard. I do iron some really tough ones inside out first, but be careful of setting creases inside out.
If you have any more questions, e-mail me at ____@____.com wishes,