Vintage 80's California Looks blue floral dress

This Vintage California Looks blue floral dress is in veey good preowned condition. Will look cute with a belt since elastic needs replacing. There isn't a size tag, assuming this is medium or large Measured laying flat waist 17" pit to pit 20" length 41" faux pearl and gold tone buttons down the front and on sleeves no shoulder pads feels like 100% polyester