What size is ideal for my height?

I'm 5'5 , what size jeans is ideal? I'm a size 3 right now..
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I weigh 140. I have friends ho aren't much shorter than me that weigh less than 120 and don't really look unhealthy.
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I'm not very tiny, and
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I've seen girls who look bigger, wear the same size and weigh less than me..
What size is ideal for my height?
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