I love Calvin Klein bras, and have several. I decided to get a strapless one for strapless summer dresses. I wear a 32D consistently in this brand (and others), so that's what I got. Thankfully the band is a little tighter than a non-strapless, but that doesn't seem to help slippage. I've had this on since 8am today and I keep having to go to the restroom and hoist it back up. It fits great and will be fine if I use it with the optional straps that are included, but on my build it just keeps heading south.