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As an expert on this topic I have a compiled a list in order with a little leeway. This is only in game art, if this were anime then Lorelei and Ivy would be number 1 and 2. This is for band size only
Leonora>Wicke≥Ariana>Professor Juniper≥Shelly≥Skyla>Jessie>Zinnia>Argenta>Karen>Dahlia>Candice=Claire=Glacia>Whitney=Morgan=Olivia=RSE Flannery=Viola=Alexa>Malva=Leaf=FRLG Sabrina=Mallow
Then there are a few that are really hard to tell because if the clothes they wear or the pose they're in
Drasna: She has the potential to be the biggest in the series, but the way her dress fits her make it very ambiguous
Bianca: 2 years is a short time for most adults, but for a girl going through it can make a huge difference. This may be the case for Bianca, as it's very hard to tell where her big puffy jacket ends and her potentially gigantic big puffy bust begins.