This is a loose, longline shirt dress (sometimes called a smock dress or oversized shirt dress).
Key features:
- Button-down front like a shirt.
- Collared neckline.
- Dropped waist seam with gathered fabric, giving it a flowy A-line silhouette.
- Long, voluminous sleeves with gathered cuffs.
It’s designed to be modest, relaxed, and comfortable — often worn as a casual piece or styled in a high-fashion way with accessories.