I'm a true size 6 in nearly every brand and this fit really well on the bottom but was quite large in the bust and torso area. I'm not busty so that may be why it gapped in the back where it buttoned but it didn't detract from the look. Like the other reviews said you need a bathroom buddy but would rent again!

Harmony Romper

Keepsake

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Size Worn: M

Usual Size: 6