So 2 thoughts:
1. If you are a 34B/32C, then your bust measurement is probably 35 or 36 or so and not 32. The bust measurement is the measurement around the widest point, and bra sizes are done so that your band is the size below your breasts and the cup is the difference between that and the wide point - so 34B = 34+2 = 36, 32C = 32+3=35. That could be one reason for the confusion.
2. I also find that I *can* wear HL without a bra, and for one of the dresses I'm probably going to wear it that way. But I found that if I do wear a molded-cup bra, then I get less squishing. So maybe you can order xxs when you're buying online, as long as the style will allow you to wear a molded-cup bra underneath. That way you get the nice tight fit around your itty bitty waist, but you can avoid the boob squish. I agree - it's nice to be able to buy online! A lot of the time the deals are so much better, and I see things online that I don't find in stores.
I hope that helps! There are other ladies on here with lots more experience, so I'll let them chime in, but those are my thoughts.