Vintage inspired floral chiffon dress ruffled sleeveless a line maxi pastel

I I, green, yellow, and a whole bunch of florals!!💐 for reference I am 5’9.5 lbs and 168 lbs, usually a L or 10 in dresses and this was too big under the sleeves and across for me so best a modern size 12-16 or XL-XXL? Not sure of the brand, tag was ripped out. Pick any size to purchase, only have 1 dress in stock but tagging multiple sizes so people can see!