Gunmetal-colored blouson dress

Condition: excellent, tried on and washed but never worn Info: Lightweight sleeveless blouson mini dress in a gunmetal color. Elastic waistband, and button closure with a long opening at the back (see last pic). No care tag. Top of shoulder to bottom hem approx 33", armpit to armpit approx 18". Story: Bought from Forever 21. Normally I remember the story behind each piece of clothing, but I'm at a loss on this one. Maybe it was just on sale? 🤔 Anyway, it's cute.