Reggie is making doll clothes for his little sister. He has 3 yards of fabric. If each dress uses 3/8 yards of fabric, how many dresses can he makes?

To find out how many dresses Reggie can make, we need to divide the total amount of fabric he has by the fabric used for each dress.

3/8 yards of fabric per dress * x dresses = 3 yards of fabric.

By multiplying both sides of the equation by 8/3, we have:

(3/8) * (8/3) * x = 3 * (8/3).

This simplifies to:

x = 8.

Therefore, Reggie can make 8 dresses. Answer: \boxed{8}.