If there's enough loose strap that you can pinch the fabric together, the car seat is too loose. (thetoddle.com)
Thank you for the list BUT very hard to continue reading an article on car seat ratings when the main picture is of a baby with loose straps and buckle not properly placed... just something I noticed! (bestcarseathub.com)
So often I have to return dresses because of loose straps that just fall off my shoulders when I can't fill out the bust) I wear white dresses a lot in the summer (see here and here) and this one is a great closet staple! (katiesbliss.com)