this stores r crazy sizinmgs!!!

I had jeans size 16 from big city chic that are always falling down so i thought i will go get some from jeans west tryed on 14, 15, 16 and 18 and NONE would fit!!!
Jeans West have the tiniest sizes ever! I need to add 2 sizes whenever I go in there (which I no longer do for that reason lol!)

Has anyone noticed as well that in the same jeans, sizes vary between short leg, average and long leg? I bought two pairs of jeans in exactly the same style and size, except one was a regular leg and one was short, and the short legs are at least a size smaller than the regular, wtf? It reminds me of the way cup sizes change with the bust sizes (e.g. a 16E will have a bigger cup than a 12E)