After reading all of the reviews saying to size up, I chose sizes 4 and 6 to try, and the 4 fit comfortably around my hips but a tiny bit loose around my waist and bust. For the record, I'm a 25 waist and 32 bust. There's also a size chart on amazon if you search up the dress, and I think it's pretty accurate.

Green Raelynn Dress

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Size Worn: 4R

Usual Size: 4

Height: 5' 5"

Weight: 120lbs

Bust: 32C