Most Helpful Girl
bras have a cup and a band. the band is how wide your back/waist is. the bigger the band size, the heavier you are. cup is how big your boobs are in comparison to your waist. i=I think the average band size is a 36 or 38. But a girl with 32C boobs does not have boobs as big as a woman with a 38C bra, they both just have boobs that are a bit larger than their back/waist region.
Clothing sizes vary by store. 00 or 0 is the smallest and they generally go up to a 14, each degree getting bigger, after that it becomes plus size which goes up to a 24 I believe. some stores sell size 14+.
Then there are stores that run differently. The standard sizing is 0-14 but some stores are cut larger or smaller. For example H&M goes 0-14 too but I wear a larger size there than I do at Gap or American Eagle or many other stores and they are known among my social circles to run small.
Then some stores or brands go by European sizes like 24-32 or whatever, that goes by waist size.
Then there are junior sizes 0 or one until size 15 or so..those are similar to misses but they are odd numbers and obviously run smaller than adult clothes do because they are made for teenagers. I wear a 4-6 in misses and I wear a 7 or 9 in juniors.