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I'm extremely glad i ordered a large instead of a medium. I have a large chest(32H) and small waist(28 inch). I'm was going to order a medium but thought my chest needed more room. So i ordered the large and its fits my chest great! Fits around my waist like a tight shirt. Remember that it's plastic bones so doesn't suck you in like a really corset but I'm fine with this since its a Halloween costume.