60s 70s baby blue dress

I believe it’s made of polyester. Zipper isn’t aligned as you can see in the photos. Maybe someone smarter than me can fix it! I’ve had some holes where seams were coming apart repaired, and it may be coming apart in other areas as well, but no holes. Some stains. Super precious and would make a great vintage Alice in wonderland Halloween costume! Bust: 15-16” Waist: 12-12.5” Length: approx. 35”