Petite, regular and tall sizes

Does anyone find this interesting:

At J.Crew:

Petite sizes range from 0P-12P

Regular sizes: o-14

Tall: 2T-14T


At Banana Republic:

Petite sizes: 00P-12P

Regular sizes: 00-16

Tall: 2-16


Why is it that petite sizes and regular sizes start with the same number (though I realize that the actual CUT is different), while tall sizes start at a 2? Wouldn't it make more sense for petite sizes to range from 00P-12P, regulars 0-14 and talls 2-16?
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