Red polka dot shift dress

Came straight from my vintage closet! Red polka dot polyester T-length shift dress. Has raglan cap sleeves with triangle button details. Invisible back zipper. Label says 9-10, however it fits more like a 6. Measurements— Length: 41.5” (from shoulder, full length) Bust: 19.5” (39” full) Waist/Hips: 18” (36” full) Arm hole opening: 6.5”