It is not good that hang a petite garment on a man's hanger or a child's shirt on an adult's hanger.                                             
      Obviously, some overlap will occur. This chart should give you a good idea on the best size for the job.

Body	Hanger Length	Torso Size
Infant	10"	6 months
Children's	12"	3/4 Years Old
Youth	14"	6/8 and 10/12 years old
Standard-female	16" - 17"	33" Chest
Standard-Male	17"	38" Chest
Women's	17" 19"	36" Chest
Men's Big and Tall	18" - 26"	40" Chest