I kind of sort of gave up on worrying about numbers on tags when I realized that womens clothing sizes have about as much to do with anything real or rational as a bag of flour has to Jupiter's rings.
Before my middle age weight gain, when I held a fairly steady weight , size, and shape for years and years, it was insane.
* chico's 00
* New York & Co 2
* Banana Republic 8
* Anne Taylor 4
* Gap 6
* Old Navy anything from a 0 to a 6
* Chadwicks 10
And so on and so forth
There's a catch: if I told you that it didn't sting a little bit when my mom didn't like my outfit & gave me a lane Bryant t-shirt from her closet, AND IT FIT... well, I'd be lying. Now I rock that t-shirt, because it is what it is and I've got better things to stress out over. Like my job that I have to leave for in about 15 minutes or so LOL