Ugh why is it so hard to find two different size dresses for a weeding that my friend wasnt for my…

Ugh why is it so hard to find two different size dresses for a weeding that my friend wasnt for my girls that is cheap because they will only wear it that one time and most likely destroyed by the end of the night. They may just have to wear different colors that she sent me that she wanted that or daddy will be mad that i spent an arm and leg time two for the girls.