Nipple slip

Nipple slip: Is a standard oops situation and a special type of nipple oops caused by a malfunction of her clothes, especially her top or bikini top, leading to a good voyeuristic view or photo of her nipples. The moment of a nipple slip is called oops situation.
Nipple slip are common to happen at:

Beaches and Pools: Especially at the end of the swimming season, bikini tops tend to be more lose. Nipple slip occur most often when she leaves the water or while playing in the surf. This type of nipple slip is independent of any breast size.
At bars during summer: Young ladies standing at the bar and wearing sexy tops quite often produce nipple slips when leaning forward. This type of nipple slip requires that she is braless and thus most often happens on very small tits and small tits.
On dance floors: This type of nipple slip requires that she is braless and thus most often happens on very small tits and small tits.

A nipple slip is often confused with a downblouse. The difference of a downblouse and a nipple slip: During a downblouse her nipple is still covered by top and only visible from a special unintended viewing angle or gap between her top and her body, while during a nipple slip her nipple is not covered at all and does not require any specific angle to see her nipple.
If the nipple slip was intentional, it can be considered a signal.