Description - Rib knit t-shirt nightgown (or dress!) from the late 80s or early 90s. It's got a cool slightly puffy rainbow screen print that says IF MAMA'S NOT HAPPY... NOBODY'S HAPPY. 

Details

Brand - G-Tees

Content - 100% Cotton

Size - Labeled One Size and it is very stretchy so it really could fit a variety of sizes - based on the measurements I'd say it's probably closest to a modern Large but in the photos it's on a size XS/S mannequin and it could stretch to fit an XXL

Shoulders - 22.5" across

Chest - 23" pit to pit, stretches to 31"

Sleeves - 18.5" from shoulder seam

Waist - 21" across, stretches to 30"

Hips - 21" across, stretches to 30"

Length - 44.5"

Condition - I don't see any flaws