Amazon EssentialsAmazon Essentials Women's Slim-Fit Tank, Pack of 2

Does anyone know if these tanks are like the Merona tanks that Target used to carry? If you don't know, please don't answer.

Will these tanks shrink after washing?

Do you have a size chart for these tank tops? i am wondering what usa 18/20 is?

The sizing has me stumped. xl is usa size 8??! in what universe? i usually wear a size l (10-12), but i'm not even on this chart. advice?