suspenders on nipples
When a shirtless character is wearing at least one suspender over their nipples. This is a way of wearing a skimpy outfit without going completely topless.
Due to the way suspenders are it is expected to see side boob and inner boob on breasted characters. These straps on bigger breasts would likely result in cleavage.
However, suspenders are also seen on characters who have pecs.
In both cases, some suspenders are too thin to sufficiently cover the nipples resulting in an areola slip.