Hang a sweater or shoe organizer from the closet rod in your child's closet. Make sure it has a compartment for each day of the week.
Work with your toddler to pick out outfits for each day of the week. He may show an interest in this activity, or not. Show him a couple of outfits -- shirt and pants or shorts -- and ask him which one he'd like to wear first. Put the one he picks in the "Monday" compartment.
Repeat Step 2 with your toddler until you've filled all of the compartments for the week with an outfit. Don't forget to place socks and underwear in each compartment.