Well I am making it for my cousin who is turning 7 in about a month. She wears size 7/8 clothes. And when I was measuring her chest today it was 24''. The pattern says for size 5 the chest is 26.5 (2.5'') bigger and that size 8 (the one I'm planning on making) is 5.5'' bigger. And I was wondering if that would be way too big.