Sizing

Just wondering what implant size people starting at an A/B cup went for to get a C/D cup?

As this is what I want to do, I know everyones different and a 300cc in one person won't give the same results in another person even with similar stats, but I just want an idea, I'll also being going for unders so I know that you need to upsize a little to account for going under. I have my consult in 3 weeks, I've found some great photos on before and after websites, so that's really helpful, and I've been amazed at what different sizes look like. I have two pics that I really like the shape of but one of them was an A to B and the other an A to C, what was weird was the A-B looked bigger I don't get it? so that's taught me not to get hung up on bra sizes, I just want them to look good. Baring all that in mind I think I'd probably need somewhere around 300cc, as despite saying I want a C cup I don't think one cup up from what I've got would be good enough (as they are an empty b cup), they'd need a good bit of filling to get them looking a better shape, I have been told I have tubular breast

Also what are sizers? I keep seeing them mentioned but I don't know what they are?

I had 410cc which they suggested I may end up a DD/E but I ended up a FF but they are exactly like the photos I too in to show my PS. I thought I only wanted to be a D/DD but am glad I didn't get too hung up on sizes.

Sizers are an inflatable device that your surgeon puts in your breast and will inflate to the cc amount you agreed on, using this they may go bigger or smaller depending on the look you wanted and if they can fit it in your breast.