Just like bike fitters have the sexy adjustable faux-bike to help with fitting, the woman at Nordstrom who fit me had a "fit" bra she had me try on in the size the tape measure suggested.

It was not a pretty bra, it was see-through and designed so she could see where the bra and I were not friendly with each other... (and we weren't very friendly)

Based on that she chose a bunch of bras for me to try, and I probably tried on 10 or 15.

I was not the size I had thought I was and would never have tried the bra that I bought. I had measured myself at home and was pretty convinced I was a 38C, but I was really a 36DD. It was that see-through fit bra and someone who knew what to look for that helped lock down the size and style I needed.

Once you find a good bra fitter, hang on to them! They have a valuable skill and a valuable knowledge of brands and their quirks. Just like a bike fitter has a skill and knows about bike brands and their fit quirks.