I tried the 10R and 12R and went with the 12, even though it was a little big in the bust. It fit better around my torso (I have a straight figure with a broad middle), The 10 zipped but would not have been comfortable sitting in. I wore 2" heels and it would have been too short with high heels.

Embroidered Tulle Gown

Marchesa Notte

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Size Worn: 12R

Usual Size: 12

Height: 5' 10"

Weight: 175lbs

Bust: 38B