Vtg 60s 70s Greenecastle Psychedelic Floral Mod Sleeveless Dress Size S/M

Vtg 60s 70s Greenecastle Psychedelic Floral Mod Sleeveless Dress Size S/M Off white background with rich shades of purple, red, pink and yellow. Tagged size 12 but runs small. Would fit a small to medium best. No fabric tag but feels like a synthetic/barkcloth blend. One pocket Back Zipper Top of dress is lined, bottom half is not. Pre owned in excellent vintage condition. One loose seam at bottom of skirt as shown in photo. Measures 40" long from shoulder to hem, 18" pit to pit, 15" across the waist.