Im 57 168lbs norm wear a size 8 comfortably.  I ordered a 12 because everyone said to order one size up in gen and I wanted mine lose.  They fit perfect.  So def go one size up for comfort.  Two if you want a loser fit.  Good quality.  Love the material.  I bought these for over my one piece suit for modesty and to cover my trouble spots.  They look cute on.