Purchased this to wear with Summer backless dresses and tops as well as a few formal dresses. As soon as it came I tried it on and wore it throughout my day, of cleaning house, to see how it stayed on, I wanted to make sure there wouldn't be any mishaps in the future... From 12pm to approx 11pm, of fairly vigorous activity, it didn't budge! It also looked natural under thin clothes and gave an added boost and even a bit of cleavage to my VERY small B cup. BTW I purchased the B because most of my other bras are 36-B's although I do have a couple of A's.

If you need a bra that doesn't show with backless clothes this is your bra!