The Laundry Quandry

The split to two rooms has been a fairly smooth transition... except on laundry days. All four of the girls put their clothes in one laundry basket, which is fine. Unfortunately, when it's time to fold the clothes, I have a hard time remembering which outfit belongs to which girl. I know, I know... out of all the stress in my life, this isn't exactly high on the list. Still, it makes things tricky.
Each of the girls have certain articles of clothing that is "theirs." It may be Hello Kitty socks one received as a reward for landing on the prize spot of the chore chart or a Minnie Mouse shirt Santa gave another for Christmas. If those clothes end up in the wrong room and someone other than the owner wears those items... there are going to be plenty of tears. It's not that my daughters don't share, it's just that they take ownership of their things. I don't think that's a bad trait. When you're expected to share nearly everything you own with three other siblings, it's nice to have a few things that are just yours.
So on laundry day I separate everything into piles... underwear, socks, pants, shirts, etc. Then I have to go through the piles to figure out if there are any items that belong to a specific girl so I can make sure it ends up in the right room. I've made some mistakes, but I have four girls who are right there, ready to correct me!