Have always loved this fantasy of being fitted for a bra by a couple of helpful, and dominant, sales clerks in the dressing room of the intimates section at a department store.  I came close a few years ago at a local Dillards store when a female sales clerk helped me select and try on a girdle.  It was mid afternoon and the Dept was empty of other shoppers.  I told her I was looking for a girdle for back support and she smiled.  She then measured my waist with a cloth tape measure, helped me pick out a couple of girdles and then took me to the fitting room.  She, of course, did not come into the changing booth, but a few minutes later she tapped on the door to tell me that she had brought me two more to try on.  It was a great experience, and I helped her out by buying two of the four girdles that I tried on that day!