Vintage VTG 1970s JP Allen Maxi Halter Sun Dress

I bought this dress from a store in the 90s. It's a 1970s JP Allen halter sun summer dress. Floral colors of sky blue, spring green, violet, and yellow. I was in high school and I wore it once. It's been in my Mom's basement ever since. I recently had it cleaned. Excellent condition, no stains or spots, no imperfections, zipper works perfectly! Polyester with off white liner underneath. Vintage tag says size 11 but fits more like a size 4/6 in 2023. Bust: 15" across Length: 46" from center of halter ("V") to bottom of skirt