I was shocked the first time I heard the owner of Linda’s Bra Salon on the Upper East Side of Manhattan announce that most women wear the wrong bra size. How can that be? Easy! Women usually buy their bras in department stores or other chains without the assistance of an expert measuring them.

For years. I counted on Linda and her team to measure me. She became so popular that you had to make an appointment a week or so in advance to buy a bra. Once you get to the store, it usually takes an hour or so to get through the buying process because of constant interruptions from other clients.

I gave up on that two years ago when Victoria’s Secret started to offer many more styles in my size. The sales women there help me, but I have no idea if they have the expertise of Linda.

My concerns in this area are finally over. There’s an app now that calculates a woman’s bra size by providing just two tank-top iPhone selfies. I know, I know, the last thing you want to do is take a sexy picture of yourself and send it to some unknown person on the Internet.

Apparently, lots of women are taking the chance because the ThirdLove app was created by Dave Spector, a former partner at Sequoia Capital, and his wife, Heidi Zak. They’ve raised $5.6 million from investors, so everyone feels it is totally safe.

The ThirdLove app features a video tutorial to help you take the photo of yourself. The iPhone is capable of accurately measuring in 3-D using a 2-D image. Get ready for this business to “bust” out. There’s lots of competition coming from True & Co. and Brayola.