This post must really be credited to The Padawan’s Guide, as they are the one who really brought it to our attention. As with most of these posts for Aesthetic Influences there is nothing we have found so far that says for sure these are the influences. Padawan’s Guide says that Trisha Bigger said that this costume was based on a Russian ball gown, clearly from the way the gowns look this is likely the case. So far we have not been able to find the interview with Trisha Bigger so we can add quoted texted.
The general shape of the dress, the yoke that covers the top of the shoulders, the cowl and crown/headdress combo. The sleeves being tight around the wrists and the sleeves been puffed slightly, in general the dress that Padme wears is very similar to Russian ball gown. Please go check out The Padawan’s Guide look at these similarities.