This costume seemed really cute in the pictures but didn't look as expected once received. The pink is much darker and the ears are floppy and not the same shape as in the picture. My 5 yr old usually wears size M or 8-10. The costume seems to run small and does not stretch much, I don't think this would fit a 8-10 yr old unless very petite. Only keeping since my daughter really wants to be a bat but overall costume is not worth the price and not as pictured.