So my daughter and niece would both wanna do the makeover- however both are clothes ages older than there yrs- my 9 yr old wears age 11-12 clothes and my 11 yr old niece age 13-14... ( neither are tubby just both tall and big for age) . So whilst both girls are within the age bracket of the make over , my worry Is will they find a dress to fit? I'm hoping American sizing is generous?