I ordered a medium size 7/8 for my 12 year old girl who is tall (5ft 1in) and skinny (103lbs). It fit her well on all sides and was perfect at the waist. I think if I had a big one it would be too big for her. I won't dry them because I'm sure they will shrink and then she won't be able to put them on at all because they are already short and sitting on her.
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