Size            length(inch)    unstretched waist size(inch) 

infant(0-2year)          7"                   14"

Petite(2-4year)          9"                   15"

Small(4-6year)           10"                 17.5"

Medium(6-8year)     13"                   19"

Large(8-10year)         15"                   20"

X-Large(10-12year)    17"                   22"

Teen-Adult                18"                   24"