On an index card or a piece of paper, draw a pattern of colors, letters, or numbers (you can also mix the symbols).
Draw the matching symbols on the bottom part of the clothespins.
Place the index card and the clothespins in front of the child. Ask the child to hold the top part of the hanger with his non-dominant hand.
Review the pattern with the child first, then ask the child to use the dominant hand to find the clothespin that has the first symbol in the raw.
Instruct the child to place the clothespin he found on the hanger, reinforcing him to use pincer grasp to open the clothespin, and crossing his mid-line by placing the clothespin on the opposite side of the hanger (i.e. if the child is right hand dominant, he will start placing the clothespins on the left side of the hanger).
Have the child continue following the pattern, placing all the matching clothespins on the hanger.