Well...that makes more sense then. That was a womans shirt though. If the kids measurment was slightly too small, it was a 12, there are still 14-16 and 18's.
Theres also the fact that not every size is going to be the same either, so even if you are a 14 in one thing, you could be a 16 in another company. Plus the cuts make them fit differently again as well.
Its too bad that the 14 is 90, cause it probably would have fit pretty close to perfect.