If you are trying to figure out correct sizing for a petite item, here's a Cheat Sheet for Petite Sizes. 

Petite sizes are defined as being for women who are 5'4" or shorter.... which is surprisingly is actually the majority of women in the United States!  The average height of an American female is 5'3.6"!  Betcha didn't know that! 

Need to measure clothing?  You can grab an awesome clothing tape measure on Amazon for as little as $2.99 with free shipping!